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= ( s × s ) + ((a+b)×t:2)
= (9 × 9) + ((9+15)×11:2)
= 81 + 132
= 213 cm²
Luas Gabungan = L.Trapesium + L.Persegi Panjang
= ((a+b)×t:2) + (p×l)
= ((13+21)×3:2) + (21×5)
= 51 + 105
= 156 cm²