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c=30
b=√30²-25²=√900-625=√275=5√11
pole Δ=½ab=½×25×5√11=62,5√11j.²
r okregu wpisanego=½(a+b-c)=½(25+5√11-30)=2,5√11-2,5=2,5(√11-1)
a²=30²-25²
a=√900-625
a=5√11≈16,5
P=16,5*25/2
P≈206,25
r=2P/a+b+c
r=206,25*2/16,5+25+30
r=5,7