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Luas 1 (trapesium)= 1/2 × (10 cm + 5 cm) × 5 cm = 1/2 × 15 cm × 5 cm = 37,5 cm²
Luas 2 (segitiga)= 1/2 × 5 cm × 5 cm = 12,5 cm²
Luas semuanya= (2 × 37,5 cm²) + (2 × 12,5 cm²) = 75 cm² + 25 cm² = 100 cm²
Maaf kalo salah :)