Question :
The area of a triangle is 15 sq cm and the radius of its encircle is 3 cm. Its perimeter is equal to:
Options :
- 12 cm
- 20 cm
- 5 cm
- 10 cm
correct answer : d)
(d) In radius × semi permeter = area of triangle
3 × S = 15
S = 5 cm
Perimeter of triangle = 2×S
= 2×5 = 10 cm