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C = √8²+15²
C = √64+225
C = √289
C = 17
K = jumlah seluruh sisi
K = 18 + 17 + 8 + 18 + 8 + 17
K = 86 cm
L = [(jumlah sisi sejajar)t] ÷ 2
L = [(18 + 34)] ÷ 2
L = [52] ÷ 2
L = 26 cm²
luas 1(18+18)15= 270cm2
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