Jawabanmu

2014-05-11T20:19:54+07:00
S=1/2 (26+28+30)=1/2(84)=42
L =42(42-26)(42-28)(42-30)=42 X 16 X 14 X 12=112896=akar 112896=336
a. rd=336/42=8 cm
b. rl=26 X 28 X 30 / 4 X 336=16,25
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