# CBSE Class 9 Maths Herons Formula MCQs Set C

1. A triangular park ABC has sides 120m, 80m and 50m . A gardener Dhania has to put a fence all around it and also plant grass inside. How much area in m2 does she need to plant?

(a) 9√15 (b) 12√15 (c) 6√15 (d) none of these

2. The sides of a triangle are 35 cm, 54 cm and 61 cm, respectively. The length of its longest altitude:

(a) 16√5 cm (b) 10√5 cm (c) 24√5 cm (d) 28 cm

3. If the area of an equilateral triangle is 16√3 cm2, then the perimeter of the triangle is:

(a) 64 cm (b) 60 cm (c) 36 cm (d) none of these

4. The length of each side of an equilateral triangle having an area of 9√3 cm2 is:

(a) 8 cm (b) 6 cm (c) 36 cm (d) 4 cm

5. The area of an equilateral triangle with side is:

(a) 5.196 cm2 (b) 0.866 cm2 (c) 3.4896 cm2 (d) 1.732 cm2

6. The sides of a triangle are 56 cm, 60 cm and 52 cm, then the area of the triangle is:

(a) 1322 cm2 (b) 1311 cm2 (c) 1344 cm2 (d) 1392 cm2

7. The perimeter of an equilateral triangle is 60 m. The area is:

(a) 15√3 m2 (b) 3√3 m2 (c) 12√3 m2 (d) none of these

8. An isosceles right triangle has area 8 cm2, then length of its hypotenuse is

(a) √32cm (b) √16cm (c) √48cm (d) √24cm

9. A traffic signal board indicating ‘SCHOOL AHEAD’ is an equilateral triangle with side a, then area of the traffic signal is:

(a) √3/2a (b) √3/4a2 (c) √3/2a  (d) none of these

10. The base of a triangle is 12 cm and height is 8 cm, then the area of a triangle is:

(a) 24 cm2 (b) 96 cm2 (c) 48 cm2 (d) 56 cm2

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