The net below depicts a triangular prism. What is the total surface area of the prism? And please explain how did you get your answer. A.282 cm B. 210 cm C.312 cm D. 624 cm

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The net below depicts a triangular prism. What is the total surface area of the prism? And please explain how did you get your answer. A.282 cm B. 210 cm C.312 cm D. 624 cm
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Answer is A - 282

You have (3) rectangles, A=L x W
6x14 = 84 x 3 shapes = 252
2 triangles A= 1/2BxH
1/2 x 6 x 5 = 15 x 2 shapes = 30
252 + 30 = 282
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