Question

find the radius of the incircle of a triangle whose sides are 15,20,25

Answer 1

Answer:

The radius of the incircle is r = 5.

Step-by-step explanation:

This is a right triangle because:

15^2 + 20^2 = 25^2

225 + 400 = 625

So the area of the triangle: A = a * b / 2 = 15 * 20 / 2 = 150

Also   A = r * s

s = ( a + b + c ) / 2 = ( 15 + 20 + 25 ) / 2 = 60 / 2 = 30

150 = r * 30

r = 150 : 30 = 5

Answer 2

Answer:

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