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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

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Q: What is the total surface area of a square prism which shows height 12 cm and base area 25 cm square?
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