Chapter 12 Heron’s Formula- MCQ Online Test 2 Class 9 Maths

1. Find the length of each side of an equilateral triangle having area of 9 root 3 cm square
(a) 36 cm
(b) 30 cm
(c) 35 cm
(d) 26 cm

2. If the height of a parallelogram having 500 cm2 as area is 20 cm, then its base is of length
(a) 45 cm
(b) 50 cm
(c) 25 cm
(d) 40 cm

3. The area of an isosceles right angled triangle of equal side 30 cm, is given as
(a) 350 cm²
(b) 454 cm²
(c) 450 cm²
(d) 500 cm²

4. If side of a scalene △ is doubled then area would be increased by
(a) 90 %
(b) 80 %
(c) 100 %
(d) 50 %

5. An isosceles right triangle has area 8 cm². The length of its hypotenuse is :
(a) √24 cm
(b) √32 cm
(c) √26 cm
(d) √19 cm

6. If the area of an equilateral triangle is 36√3 cm², then the perimeter of the triangle is
(a) 66 cm
(b) 33 cm
(c) 36 cm
(d) 40 cm

7. Given the product of diagonals of a rhombus ABCD is 2500 cm², its area is
(a) 1250 cm²
(b) 1170 cm²
(c) 1550 cm²
(d) 1230 cm²

8. The area and length of one diagonal of a rhombus are given as 200 cm² and 10 cm respectively. The length of other diagonal is
(a) 38 cm
(b) 34 cm
(c) 40 cm
(d) 30 cm

9. In each side of a △ is halved then its perimeter will be decreased by
(a) 75 %
(b) 80 %
(c) 50 %
(d) 100 %

10. Area of the given triangle is

(a) 50 cm²
(b) 30 cm²
(c) 34 cm²
(d) 35 cm²