= 2 × ½ × a × t
= 2 × ½ × 3 cm × 4 cm
= 12 cm²
= ( 3 cm + 4 cm + 5 cm ) × 6 cm
= 12 cm × 6 cm
= 72 cm²
= 12 cm² + 72 cm²
= 84 cm²
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Langkah pengerjaan:
= 2 × ½ × a × t
= 2 × ½ × 3 cm × 4 cm
= 12 cm²
= ( 3 cm + 4 cm + 5 cm ) × 6 cm
= 12 cm × 6 cm
= 72 cm²
= 12 cm² + 72 cm²
= 84 cm²