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a = 15-12
= 3
t = √5²-3²
= √ 25-9
= √ 16
= 4
jawaban soal A
luas = (a+b) x t/2
= ( 12+15) x 4/2
= 27 x 2
= 54 cm²
jawaban soal B
kliling = 12 + 15 + 4 +5
= 36 cm