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Lj = 3,14 * 10²
Lj = 3,14 * 100
Lj = 314 cm²
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Luas segitiga = 1/2 * alas * tinggi
Luas Δ = 1/2 * 10 * 10
Luas Δ = 50 cm²
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Luas yang diarsir/tembereng = luas juring-luas segitiga
L. tembereng = 314-50
L. tembereng = 264 cm²