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= 1/2 x 5 x 5
= 12,5
trapesium 1 =1/2x (a+b) x tinggi
= 1/2 x ( 2 + 4) x 2,5
= 3 x 2,5 = 7,5
trapesium 2 = 7,5
12,5 + 7,5 + 7,5 = 27,5 cm
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