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306 cm2 = 2((5x × 2x) + (5x × 1×) + (2× × 1×)
306 cm2 = 2(10x^2 + 5x^2 + 2x^2)
306/2 cm2 = 17x^2
x^2 = 153/17 cm2
x^2 = 9 cm2
x = 3
V = plt
V = 3(5) × 3(2) × 3(1) cm3
= 15 × 6 × 3 cm3
= 270 cm3