Pls answer this question fast :
If a, b, c are the sides of a triangle where c is the hypotenuse, then prove that radius r of the circle touches the sides of the triangle is given by r=(a+b- c)/2.
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https://www.meritnation.com/ask-answer/question/if-sides-a-b-c-are-the-sides-of-a-right-triangle-where-c/circles/3564218
https://www.meritnation.com/ask-answer/question/if-sides-a-b-c-are-the-sides-of-a-right-triangle-where-c/circles/3564218