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Jawaban:

1. a.K=4xS= 4×10=40.

1.b.K=2×(P+L)=2×(25+15)=2×40=80. 1.c. K=a+b+c=12+13+5=30 2.a. L=P×L=52×25=1.300. 2.b.L=S×S=15×15=225. 2.c. 1/2×a×t=1/2×15×13=1/2×195=97,5. Maaf jika salah

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