Area of the incircle of the right angled triangle whose sides are 9,12&15 unit

[@adgf1x]

18R=54=>R=3.ar. circle inscribed=9pai when pai=22/7.

[@mathematicsformankind-onlinecl]

Weldon. 👍

[@spdas5942]

1/2(a+b+c).r=1/2(ab)=>(a+b+c).r=ab=>r=ab/(a+b+c)=9*12/(9+12+15)=9*12/36=3. Area of the circle=π.3^2=9π.

[@mathematicsformankind-onlinecl]

Well approach. Thank you sir.