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= (6²) + 4 (1/2 × 6 × 9)
= 36 + 108
= 144 cm²
(6 x 6) + (4 (6 x 9) : 2)
36 + (4 x 54 : 2)
36 + (216 : 2)
36 + 108 = 144 cm²