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caranya:
L persegi panjang = p x l = 48 x 32 = 1.536 cm2
L segitiga = 1/2 x a x t = 1/2 x 16 x 16 = 128 cm2
karena ada 4 segitiga jadi 128 x 4 = 512 cm2
jadi : L persegi panjang - L segitiga = 1.536 - 512 = 1.024 cm2
moga bener ya.