The area of a triangle is 15 sq cm and the radius of its incircle is 3 cm. Its perimeter is equal to?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 10 cm
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Concept |
Understanding |
Application |
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In-radius of triangle = (Area of triangle)/Semi Perimeter(s) |
Given: Area of a triangle = 15 sq cm And Radius of its incircle = 3 cm |
⇒ 3 = 15/s ⇒ Semi perimeter(s) = 5 ∴ Perimeter = 2S = 2 × 5 = 10 cm |