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= 1/2 × jumlah sisi sejajar × tinggi
= 1/2 × (15 + 13) × 7
= 1/2 × 28 × 7
= 14 × 7
= 98 cm²
- Luas jajargenjang
= alas × tinggi
= 15 × 9
= 135 cm²
- Luas gabungan
= Luas trapesium + luas jajargenjang
= 98 cm² + 135 cm²
= 233 cm²