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Luas =√s(s-a)(s-b)(s-c)
jari luar linkg=abc/4 L
s=(a+b+c)/2=(26+28+30)/2=42
LUAS=√42(42-26)(42-28)(42-30)=√42x16x14x12=√14x3x16x14x3x4=14x3x4=168
r = L/s= 168/42=4
R=26x28x30/(4 x168)=32.5