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Luas=180 cm
d1=15 cm
d2=?
penyelesaian:
L = 1/2 × d1 × d2
180 = 1/2 × 15 cm × d2
180 = 15/2 cm × d2
180 ÷ 15/2=d2
180 ÷ 2/15=d2
180÷15×2 =d2
12×2 = d2
24 = d2
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