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50 = 4.s
50/4 = s
12.5 = s
15/2 = 7.5
√12.5²-7.5²
√156,25-56.25
√100 =10
10.2 = 20 (d₂)
L = 1/2.d₁.d2
= 1/2.15.20
= 150 cm²
maaf kalau salah:)