Question
The base of a solid right prism is a triangle whose
sides are 20cm, 21cm and 29cm. the height of the prism is 6 cm then the total surface area of the prism is?Solution
As 20, 21Â & 29 is satisfying Pythagoras so it is a right angle triangle. Total surface area of prism = Perimeter of baseĂ— Height + 2 Ă— Area of base = (20 + 21 + 29) Ă— 6 + 2 Ă— (1/2 Ă— 20 Ă— 21) = 70 Ă— 6 + 2 Ă— 210 = 420 + 420 = 840 cm 2Â
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