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panjang jari2 luar = ( a x b x c )/4 x luas segitiga
s = 1/2 (a+b+c) = 1/2(13+13+10) =18
luas segitiga = √s(s-a)(s-b)(s-c)
= √ 18 (6)(6)(8) = √ 9 x 2 x 2 x 3 x 3 x 2x2x4
= 3x2x3x2=36
pnajng jari2 dalam = 36/18=2