NCERT Solutions Class 10 Mathematics Chapter 9 Some Application of Trigonometry

NCERT Solutions Class 10 Mathematics Chapter 9 Some Application of Trigonometry have been provided below and is also available in Pdf for free download. The NCERT solutions for Class 10 Mathematics have been prepared as per the latest syllabus, NCERT books and examination pattern suggested in Class 10 by CBSE, NCERT and KVS. Questions given in NCERT book for Class 10 Mathematics are an important part of exams for Class 10 Mathematics and if answered properly can help you to get higher marks. Refer to more Chapter-wise answers for NCERT Class 10 Mathematics and also download more latest study material for all subjects. Chapter 9 Some Application of Trigonometry is an important topic in Class 10, please refer to answers provided below to help you score better in exams

Chapter 9 Some Application of Trigonometry Class 10 Mathematics NCERT Solutions

Class 10 Mathematics students should refer to the following NCERT questions with answers for Chapter 9 Some Application of Trigonometry in Class 10. These NCERT Solutions with answers for Class 10 Mathematics will come in exams and help you to score good marks

Chapter 9 Some Application of Trigonometry NCERT Solutions Class 10 Mathematics

Q.1) A circus artist is climbing a 20 m long rope, which is tightly stretched and tied from the top of a vertical pole to the ground. Find the height of the pole, if the angle made by the rope with the ground level is 30°
Sol.1) Let AB be the vertical pole AC be 20 m long rope tied to point C.
In right 𝛥𝐴𝐵𝐶,
𝑠𝑖𝑛 30° = 𝐴𝐵/𝐴𝐶
⇒ 1/2 = 𝐴𝐵/20
⇒ 𝐴𝐵 = 20/2
⇒ 𝐴𝐵 = 10
The height of the pole is 10 𝑚.

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Q.2) A tree breaks due to storm and the broken part bends so that the top of the tree touches the ground making an angle 30° with it. The distance between the foot of the tree to the point where the top touches the ground is 8 m. Find the height of the tree.
Sol.2) Let AC be the broken part of the tree.
∴ Total height of the tree = 𝐴𝐵 + 𝐴𝐶
In right 𝛥𝐴𝐵𝐶,
𝑐𝑜𝑠 30° = 𝐵𝐶/𝐴𝐶
⇒ √3/2 = 8/𝐴𝐶
⇒ 𝐴𝐶 = 16/√3
Also, 𝑡𝑎𝑛 30° = 𝐴𝐵/𝐵𝐶
⇒ 1/√3 = 𝐴𝐵/8
⇒ 𝐴𝐵 = 8/√3
Total height of the tree = 𝐴𝐵 + 𝐴𝐶 = 16/√3 + 8/√3 = 24/√3

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Q.3) A contractor plans to install two slides for the children to play in a park. For the children below the age of 5 years, she prefers to have a slide whose top is at a height of 1.5 𝑚, and is inclined at an angle of 30° to the ground, whereas for elder children, she wants to have a steep slide at a height of 3 𝑚, and inclined at an angle of 60° to the ground. What should be the length of the slide in each case?
Sol.3) There are two slides of height 1.5 𝑚 and 3 𝑚. (Given)
Let AB is 1.5 m and PQ be 3 m slides.
ABC is the slide inclined at 30° with length AC and PQR is the slide inclined at 60° with length PR.
A/q,
In right 𝛥𝐴𝐵𝐶,
sin 30 ° = 𝐴𝐵/𝐴𝐶
A⇒ 1/2 = 1.5/𝐴𝐶
⇒ 𝐴𝐶 = 3𝑚

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry

also, In right 𝛥𝑃𝑄𝑅,
sin 60° = 𝑃𝑄/𝑃𝑅
⇒ √3/2 = 3/𝑃𝑅
⇒ 𝑃𝑅 = 2√3 𝑚
Hence, length of the slides are 3 𝑚 and 2√3 𝑚 respectively

Q.4) The angle of elevation of the top of a tower from a point on the ground, which is 30 𝑚 away from the foot of the tower, is 30°. Find the height of the tower.
Sol.4) Let AB be the height of the tower and C is the point elevation which is 30 m away from the foot of the tower.
A/q,
In right 𝛥𝐴𝐵𝐶,
𝑡𝑎𝑛 30° = 𝐴𝐵/𝐵𝐶
⇒ 1/√3 = 𝐴𝐵/30
⇒ 𝐴𝐵 = 10√3
Thus, the height of the tower is 10√3 𝑚

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-5

Q.5) A kite is flying at a height of 60 m above the ground. The string attached to the kite is temporarily tied to a point on the ground. The inclination of the string with the ground is 60°. Find the length of the string, assuming that there is no slack in the string.
Sol.5) Let BC be the height of the kite from the ground, AC be the inclined length of the string
from the ground and A is the point where string of the kite is tied.
A/q,
In right 𝛥𝐴𝐵𝐶,
𝑠𝑖𝑛 60° = 𝐵𝐶/𝐴𝐶
⇒ √3/2 = 60/𝐴𝐶
⇒ 𝐴𝐶 = 40√3𝑚
Thus, the length of the string from the ground is 40√3 𝑚.

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Q.6) A 1.5 m tall boy is standing at some distance from a 30 m tall building. The angle of elevation from his eyes to the top of the building increases from 30° to 60° as he walks towards the building. Find the distance he walked towards the building.
Sol.6) Let the boy initially standing at point Y with inclination 30° and then he approaches the
building to the point X with inclination 60°.
∴ 𝑋𝑌 is the distance he walked towards the building.
also, 𝑋𝑌 = 𝐶𝐷.
Height of the building = 𝐴𝑍 = 30 𝑚
𝐴𝐵 = 𝐴𝑍 − 𝐵𝑍 = (30 − 1.5) = 28.5 𝑚
A/q,
In right 𝛥𝐴𝐵𝐷,
tan 30° = 𝐴𝐵/𝐵𝐷
⇒ 1/√3 = 28.5/𝐵𝐷
⇒ 𝐵𝐷 = 28.5√3 𝑚
also, In right 𝛥𝐴𝐵𝐶,
tan 60° = 𝐴𝐵/𝐵𝐶

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-3

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-6

Q.7) From a point on the ground, the angles of elevation of the bottom and the top of a transmission tower fixed at the top of a 20 m high building are 45° and 60° respectively.
Find the height of the tower.
Sol.7) Let BC be the 20 m high building. D is the point on the ground from where the elevation is taken.
Height of transmission tower = 𝐴𝐵 = 𝐴𝐶 − 𝐵𝐶
A/q,
In right 𝛥𝐵𝐶𝐷
tan 45° = 𝐵𝐶/𝐶𝐷
⇒ 1 = 20/𝐶𝐷
⇒ 𝐶𝐷 = 20 𝑚
also, In right 𝛥𝐴𝐶𝐷,
tan 60° = 𝐴𝐶/𝐶𝐷
⇒ √3 = 𝐴𝐶/20
⇒ 𝐴𝐶 = 20√3𝑚
Height of transmission tower = 𝐴𝐵 = 𝐴𝐶 − 𝐵𝐶 = (20√3 − 20) 𝑚 = 20(√3 − 1) 𝑚.

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Q.8) A statue, 1.6 m tall, stands on the top of a pedestal. From a point on the ground, the angle of elevation of the top of the statue is 60° and from the same point the angle of elevation of the top of the pedestal is 45°. Find the height of the pedestal
Sol.8) Let AB be the height of statue.
D is the point on the ground from where the elevation is taken.
Height of pedestal = 𝐵𝐶 = 𝐴𝐶 − 𝐴𝐵
A/q,
In right 𝛥𝐵𝐶𝐷,
tan 45° = 𝐵𝐶/𝐶𝐷
⇒ 1 = 𝐵𝐶/𝐶𝐷
⇒ 𝐵𝐶 = 𝐶𝐷.
also, In right 𝛥𝐴𝐶𝐷,
tan 60° = 𝐴𝐶/𝐶𝐷
⇒ √3 = 𝐴𝐵 + 𝐵𝐶/𝐶𝐷
⇒ √3𝐶𝐷 = 1.6 𝑚 + 𝐵𝐶
⇒ √3𝐵𝐶 = 1.6 𝑚 + 𝐵𝐶
⇒ √3𝐵𝐶 − 𝐵𝐶 = 1.6 𝑚
⇒ 𝐵𝐶(√3 − 1) = 1.6 𝑚
⇒ 𝐵𝐶 = (1.6/√3−1) 𝑚
⇒ 𝐵𝐶 = 0.8(√3 + 1) 𝑚

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-8

Thus, the height of the pedestal is 0.8(√3 + 1)𝑚.

Q.9) The angle of elevation of the top of a building from the foot of the tower is 30° and the angle of elevation of the top of the tower from the foot of the building is 60°. If the tower is 50 m high, find the height of the building.
Sol.9) Let CD be the height of the tower equal to 50 𝑚 (Given)
Let AB be the height of the building.
BC be the distance between the foots of the building and the tower.
Elevation is 30° and 60° from the tower and the building respectively.
A/q,
In right 𝛥𝐵𝐶𝐷,
tan 60° = 𝐶𝐷/𝐵𝐶
⇒ √3 = 50/𝐵𝐶
⇒ 𝐵𝐶 = 50/√3
also, In right 𝛥𝐴𝐵𝐶,
tan 30° = 𝐴𝐵/𝐵𝐶
⇒ 1/√3 = 𝐴𝐵/𝐵𝐶
⇒ 𝐴𝐵 = 50/3
Thus, the height of the building is 50/3.

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-10

Q.10) Two poles of equal heights are standing opposite each other on either side of the road, which is 80 𝑚 𝑤𝑖𝑑𝑒. From a point between them on the road, the angles of elevation of the top of the poles are 60° and 30°, respectively. Find the height of the poles and the distances of the point from the poles
Sol.10) Let AB and CD be the poles of equal height.
O is the point between them from where the height of elevation taken.
BD is the distance between the poles.
A/q,
𝐴𝐵 = 𝐶𝐷, 𝑂𝐵 + 𝑂𝐷 = 80 𝑚
Now, In right 𝛥𝐶𝐷𝑂,
tan 30° = 𝐶𝐷/𝑂𝐷
⇒ 1/√3 = 𝐶𝐷/𝑂𝐷
⇒ 𝐶𝐷 = 𝑂𝐷/√3 ... (i)
also, In right 𝛥𝐴𝐵𝑂,
tan 60° = 𝐴𝐵/𝑂𝐵
⇒ √3 = 𝐴𝐵/80−𝑂𝐷
⇒ 𝐴𝐵 = √3(80 − 𝑂𝐷)
𝐴𝐵 = 𝐶𝐷 (Given)
⇒ √3(80 − 𝑂𝐷) = 𝑂𝐷/√3
⇒ 3(80 − 𝑂𝐷) = 𝑂𝐷
⇒ 240 − 3 𝑂𝐷 = 𝑂𝐷
⇒ 4 𝑂𝐷 = 240
⇒ 𝑂𝐷 = 60
Putting the value of OD in equation (i)
𝐶𝐷 = 𝑂𝐷/√3
⇒ 𝐶𝐷 = 60/√3
⇒ 𝐶𝐷 = 20√3 𝑚
also, 𝑂𝐵 + 𝑂𝐷 = 80 𝑚
⇒ 𝑂𝐵 = (80 − 60) 𝑚 = 20 𝑚
Thus, the height of the poles are 20√3 𝑚 and distance from the point of elevation are 20𝑚 and 60 𝑚 respectively.

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-9

Q.11) A TV tower stands vertically on a bank of a canal. From a point on the other bank directly opposite the tower, the angle of elevation of the top of the tower is 60°. From another point 20 𝑚 away from this point on the line joining this point to the foot of the tower, the angle of elevation of the top of the tower is 30° (see Fig.). Find the height of the tower and the width of the canal.

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Sol.11) Here, AB is the height of the tower.
𝐶𝐷 = 20 𝑚 (given)
A/q,
In right 𝛥𝐴𝐵𝐷,
tan 30° = 𝐴𝐵/𝐵𝐷
⇒ 1/√3 = 𝐴𝐵/20+𝐵𝐶
⇒ 𝐴𝐵 = 20+𝐵𝐶/√3 ... (i)
also, In right 𝛥𝐴𝐵𝐶,
tan 60° = 𝐴𝐵/𝐵𝐶
⇒ √3 = 𝐴𝐵/𝐵𝐶
⇒ 𝐴𝐵 = √3 𝐵𝐶 ... (ii)
From equation (i) and (ii)
𝐴𝐵 = √3𝐵𝐶 = 20+𝐵𝐶/√3
⇒ 3 𝐵𝐶 = 20 + 𝐵𝐶
⇒ 2 𝐵𝐶 = 20
⇒ 𝐵𝐶 = 10 𝑚
Putting the value of BC in equation (ii)
𝐴𝐵 = 10√3 𝑚
Thus, the height of the tower 10√3 𝑚 and the width of the canal is 10 𝑚.

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-12

Q.12) From the top of a 7 𝑚 high building, the angle of elevation of the top of a cable tower is 60° and the angle of depression of its foot is 45°. Determine the height of the tower.
Sol.12) Let AB be the building of height 7 m and EC be the height of tower.
A is the point from where elevation of tower is 60° and the angle of depression of its foot is 45°
𝐸𝐶 = 𝐷𝐸 + 𝐶𝐷
also, 𝐶𝐷 = 𝐴𝐵 = 7 𝑚. and 𝐵𝐶 = 𝐴𝐷
A/q,
In right 𝛥𝐴𝐵𝐶,
tan 45° = 𝐴𝐵/𝐵𝐶
⇒ 1 = 7/𝐵𝐶
⇒ 𝐵𝐶 = 7 𝑚 = 𝐴𝐷
also, In right 𝛥𝐴𝐷𝐸,
tan 60 ° = 𝐷𝐸/𝐴𝐷
⇒ √3 = 𝐷𝐸/7
⇒ 𝐷𝐸 = 7√3 𝑚
Height of the tower = 𝐸𝐶 = 𝐷𝐸 + 𝐶𝐷 = (7√3 + 7) 𝑚 = 7(√3 + 1) 𝑚.

Q.13) . As observed from the top of a 75 m high lighthouse from the sea-level, the angles of depression of two ships are 30° and 45°. If one ship is exactly behind the other on the same side of the lighthouse, find the distance between the two ships.
Sol.13) Let AB be the lighthouse of height 75 𝑚.
Let C and D be the positions of the ships.
30° and 45° are the angles of depression from the lighthouse.
A/q,
In right 𝛥𝐴𝐵𝐶,
tan 45° = 𝐴𝐵/𝐵𝐶
⇒ 1 = 75/𝐵𝐶
⇒ 𝐵𝐶 = 75 𝑚
also, In right 𝛥𝐴𝐵𝐷,
tan 30° = 𝐴𝐵/𝐵𝐷
⇒ 1/√3 = 75/𝐵𝐷
⇒ 𝐵𝐷 = 75√3 𝑚
The distance between the two ships = 𝐶𝐷 = 𝐵𝐷 − 𝐵𝐶
= (75√3 − 75) 𝑚 = 75(√3 − 1) 𝑚.

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-13

Q.14) A 1.2 𝑚 tall girl spots a balloon moving with the wind in a horizontal line at a height of 88.2 𝑚 from the ground. The height of 88.2 𝑚 from the ground. The angle of elevation of the balloon from the eyes of the girl at any instant is 60°.After some time, the angle of elevation reduces to 30° (see Fig.). Find the distance travelled by the balloon during the interval.

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-14

Sol.14) Let the initial position of the balloon be A and final position be B.
Height of balloon above the girl height = 88.2 𝑚 − 1.2 𝑚 = 87 𝑚
Distance travelled by the balloon = 𝐷𝐸 = 𝐶𝐸 − 𝐶𝐷
A/q, In right 𝛥𝐵𝐸𝐶,
tan 30 ° = 𝐵𝐸/𝐶𝐸
⇒ 1/√3 = 87/𝐶𝐸
⇒ 𝐶𝐸 = 87√3 𝑚
also, In right 𝛥𝐴𝐷𝐶,
tan 30° = 𝐴𝐷/𝐶𝐷
⇒ √3 = 87/𝐶𝐷
⇒ 𝐶𝐷 = (87/√3)𝑚 = 29√3𝑚
Distance travelled by the balloon = 𝐷𝐸 = 𝐶𝐸 – 𝐶𝐷
= (87√3 − 29√3)𝑚 = 29√3(3 − 1) 𝑚 = 58√3 𝑚.

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-15

Q.15) A straight highway leads to the foot of a tower. A man standing at the top of the tower observes a car at an angle of depression of 30°, which is approaching the foot of the tower with a uniform speed. Six seconds later, the angle of depression of the car is found to be 60°. Find the time taken by the car to reach the foot of the tower from this point.
Sol.15) Let AB be the tower.
D is the initial and C is the final position of the car respectively.
Angles of depression are measured from A.
BC is the distance from the foot of the tower to the car.
A/q,
In right 𝛥𝐴𝐵𝐶,
tan 60° = 𝐴𝐵/𝐵𝐶
⇒ √3 = 𝐴𝐵/𝐵𝐶
⇒ 𝐵𝐶 = 𝐴𝐵/√3 𝑚
also, In right 𝛥𝐴𝐵𝐷,
tan 30° = 𝐴𝐵/𝐵𝐷
⇒ 1/√3 = 𝐴𝐵/𝐵𝐶 + 𝐶𝐷
⇒ 𝐴𝐵√3 = 𝐵𝐶 + 𝐶𝐷
⇒ 𝐴𝐵√3 = 𝐴𝐵/√3 + 𝐶𝐷
⇒ 𝐶𝐷 = 𝐴𝐵√3 − 𝐴𝐵/√3
⇒ 𝐶𝐷 = 𝐴𝐵 (√3 −/1/√3)
⇒ 𝐶𝐷 = 2𝐴𝐵/√3
Here, distance of BC is half of CD.
Thus, the time taken is also half.
Time taken by car to travel distance 𝐶𝐷 = 6 𝑠𝑒𝑐.
Time taken by car to travel 𝐵𝐶 = 6/2 = 3 𝑠𝑒𝑐

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-16

Q.16) The angles of elevation of the top of a tower from two points at a distance of 4 m and 9 m from the base of the tower and in the same straight line with it are complementary. Prove that the height of the tower is 6 m.
Sol.16) Let AB be the tower.
C and D be the two points with distance 4 𝑚 and 9 𝑚 from the base respectively.
A/q,
In right 𝛥𝐴𝐵𝐶,
tan 𝑥 = 𝐴𝐵/𝐵𝐶
⇒ tan 𝑥 = 𝐴𝐵/4
⇒ 𝐴𝐵 = 4 tan 𝑥 ... (i)
also,
In right 𝛥𝐴𝐵𝐷,
tan(90° − 𝑥) = 𝐴𝐵/𝐵𝐷
⇒ cot 𝑥 = 𝐴𝐵/9
⇒ 𝐴𝐵 = 9 cot 𝑥 ... (ii)
Multiplying equation (i) and (ii)
𝐴𝐵2 = 9 cot 𝑥 × 4 tan 𝑥
⇒ 𝐴𝐵2 = 36
⇒ 𝐴𝐵 = ± 6
Height cannot be negative. Therefore, the height of the tower is 6 m.
Hence, Proved.

""NCERT-Solutions-Class-10-Mathematics-Chapter-9-Some-Application-of-Trigonometry-17

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