Question : The base of a right prism is a square having a side of 15 cm. If its height is 8 cm, then find the total surface area.
Option 1: 940 cm2
Option 2: 920 cm2
Option 3: 900 cm2
Option 4: 930 cm2
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Correct Answer: 930 cm 2
Solution :
Area of a base of the prism = (side) 2 = (15) 2 = 225 cm 2 Perimeter of a base of the prism = 4 × (side) = 4 × (15) = 60 cm The total surface area of a prism = (2 × Area of a base) + (Perimeter of a base × Height of a prism) = (2 × 225) + (60 × 8) = 450 + 480 = 930 cm 2 Hence, the correct answer is 930 cm 2 .
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