Matematika

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  • no 31) IPA = 360° - (138° + 72° + 90°) = 60°
    IPA = 60°/360° × 60 = 1/6 × 60 = 10 org

    no 32) luas bola = ½ × 4 × π × r² = ½ × 4 × 22/7 × 14 × 14 = 1232 cm²
    luas tutup = π × r² = 22/7 × 14 × 14 = 616 cm²
    total = 1232 + 616 = 1848 cm²

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