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= 16 cm
L trapesium besar = 1/2 × (a + b) × t
= 1/2 × (10 + 32) × 16
= 1/2 × 42 × 16
= 21 × 16
= 336 cm²
L trapesium kecil = 1/2 × (a + b) × t
= 1/2 × (7 + 10) × 8
= 1/2 × 17 × 8
= 17 × 4
= 68 cm²
L arsiran = L trapesium besar - L trapesium kecil
= 336 cm² - 68 cm²
= 268 cm²
Jadi jawabannya adalah yang D. 268.