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y₁ = 3 cm
A₁ = 6 * 6 = 36 cm²
Benda segitiga
y₂ = ¹/₃ * tinggi = ¹/₃ * 3 = 1 cm
A₂ = ¹/₂ * 6 * 3 = -9 cm²
Jawaban D