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= 1/2 × (a + b) × t
= 1/2 × (18 + 6) × 9
= 1/2 × 24 × 9
= 216/2
= 108 cm²
L = L Persegi Panjang
= p × l
= 24 × 8
= 192 cm²
L = L1 + L2
= 108 + 192
= 300 cm²