= 2La + ka × t
= 2 × a × t ÷ 2 + ka × t
= 2 × 5 cm × 12 cm ÷ 2 + (5 + 12 + 13) × 20 cm
= 60 cm² + 30 cm × 20 cm
= 60 cm² + 600 cm²
= 660 cm²
= La × t
= 5 cm × 12 cm ÷ 2 × 20 cm
= 30 cm² × 20 cm
= 600 cm³
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A. Luas permukaan
= 2La + ka × t
= 2 × a × t ÷ 2 + ka × t
= 2 × 5 cm × 12 cm ÷ 2 + (5 + 12 + 13) × 20 cm
= 60 cm² + 30 cm × 20 cm
= 60 cm² + 600 cm²
= 660 cm²
B. Volume
= La × t
= 5 cm × 12 cm ÷ 2 × 20 cm
= 30 cm² × 20 cm
= 600 cm³