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BC = 3 cm
AB = 13 cm
gambar ada pada lampiran
CD² = AB² - (AD - BC)²
= 13² - (8 - 3)²
= 169 - 25
= 144
CD = √144
CD = 12 cm
Luas ABCD = 1/2 × (AB + BC) × CD
= 1/2 × (8 + 3) cm × 12 cm
= 11 × 6 cm²
= 66 cm²