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Panjang AB = 11 + 5 = 16
Penyelesaian :
Luas BCDE = Luas ABC - Luas ADE
= (16 × 12 ÷ 2) - (5 × 5 ÷ 2)
= 96 - 12,5
= 83,5
Jadi jawabannya adalah C.83,5