Question

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Answer 1

Answer: 3173 mm² (Answer C)

Area of the bottom triangle = 1/2 x base x height
Area of the bottom triangle = 1/2 x 19 x 23 = 218.5mm²

Area of the top triangle = area of the bottom triangle
Area of the top triangle = 218.5mm²

Area of the 3 side rectangles  = (23 x 38) + (19 x 38) + (30 x 38)  
Area of the 3 side rectangles  = 2736 mm²

Total Surface area = 218.5 + 218.5 + 2736 = 3173 mm²

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Answer: Total Surface area = 3173 mm²
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