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4x15=60 5x12=60
10x6=60 60x1=60 2x30=60 4x15=60 20x3=60 5x12=60
61 there are 12 inches per foot so 5x12 + 1 = 61
The base is a square, so since it's area is 25 cm2 it's sides are 5 cm each in length. Thus, the rectangular sides of the prism have an area of 5x12 or 60 cm2. The total surface area is the sum of the 4 rectangular sides at 60 cm2 and the two square faces at 25 cm2.4*60 + 2*25 = 240 + 50 = 290 cm2