CBSE Class 7 Mathematics A Tale of Three Intersecting Lines MCQs Set D

Question. The result that the sum of the three angles in any triangle is 180° is known as what?
(a) Parallel Line Property
(b) Alternate Angle Property
(c) Angle Sum Property of triangles
(d) Straight Angle Property

Answer: C

Question. In △ABC, if ∠ B = 50° and ∠ C = 70°, what is ∠ A, tell me?
(a) 50°
(b) 70°
(c) 60°
(d) 120°

Answer: C

Question. What is true for exterior angles of a triangle?
(a) Equal to the interior angle
(b) Sum is 360°
(c) Always 90°
(d) Equal to sum of opposite interior angles

Answer: D

Question. If two angles of a triangle are 90° and 30°, what is the measure of the third angle?
(a) 120°
(b) 180°
(c) 60°
(d) 30°

Answer: C

Question. If two angles of a triangle are 70° and 70°, the third angle value will be how much?
(a) 140°
(b) 70°
(c) 40°
(d) 110°

Answer: C

Question. If all the angles in a triangle must be equal, then the measure of each angle is?
(a) 90°
(b) 180°
(c) 60°
(d) 45°

Answer: C

Question. In △ABC, if ∠ B = \angle C and ∠ A = 50°, what is the value of ∠ B?
(a) 50°
(b) 130°
(c) 65°
(d) 90°

Answer: C

Question. Which triangle has one angle greater than 90°?
(a) Obtuse-angled
(b) Right-angled
(c) Acute-angled
(d) Scalene

Answer: A

Question. The angle formed between the extension of one side of a triangle and the other side is called what kind of angle?
(a) Interior angle
(b) Acute angle
(c) Exterior angle
(d) Vertical angle

Answer: C

Question. If the interior angle ∠ ACB = 70°, what is the adjacent exterior angle ∠ ACD?
(a) 70°
(b) 90°
(c) 110°
(d) 180°

Answer: C

Question. What is meant by the word 'height' of a vertex from its opposite side in a triangle?
(a) The length of the side
(b) The length of the median
(c) The length of the altitude
(d) The measure of the angle

Answer: C

Question. The line segment AD, which is perpendicular from vertex A to side BC, is one of the what of the triangle?
(a) Medians
(b) Heights of the perimeter
(c) Altitudes
(d) Right angles

Answer: C

Question. In triangle ∆ABC, ∠B = ∠C and ∠A = 50°, what is ∠B?
(a) 50°
(b) 45°
(c) 65°
(d) 60°

Answer: C

Question. A triangle where one of the angles is a right angle is called what?
(a) Acute-angled triangle
(b) Obtuse-angled triangle
(c) Right-angled triangle
(d) Equilateral triangle

Answer: C

Question. In a triangle, if all three angles are acute angles, the triangle is called what?
(a) Obtuse-angled triangle
(b) Right-angled triangle
(c) Acute-angled triangle
(d) Equilateral triangle

Answer: C

Question. The line segment AD which is perpendicular from vertex A to the opposite side BC is one of the what of the triangle?
(a) Medians
(b) Equal sides
(c) Altitudes
(d) Straight angles

Answer: C

Question. To draw the altitude accurately, we use a ruler along with which other geometry tool?
(a) Protractor
(b) Compass
(c) Set square
(d) Divider

Answer: C

Question. If a triangle has angles 75°, 45° and 60°, what is it?
(a) Obtuse-angled
(b) Right-angled
(c) Acute-angled
(d) Equilateral

Answer: C

Question. When we talk about the 'height' of a vertex from its opposite side, we are talking about the length of which segment?
(a) The perpendicular
(b) The corner side
(c) The altitude
(d) The base line

Answer: C

Question. If a side of a triangle is perpendicular to an adjacent side, then that side is also an altitude. This type of triangle has which angle?
(a) An acute angle
(b) An obtuse angle
(c) A right angle
(d) A straight angle

Answer: C