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maths homework - geometry

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kags | 19:40 Thu 29th Jan 2009 | How it Works
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my son has been asked to calculate the volume and surface area of a triangular prism. The base is a right angled scalene triangle, the sides adjoining the right angle being 200cm and 50cm. The hypotenuse is not given. The prism is 300 centimetres long. He has calculated the volume as 200 x 50 x 300 divided by 2, which I think is correct. However, to calculate the surface area he needs the length of the hypotenuse, to calculate the area of the side of the rectangular side of the prism. He is absolutely adamant that he has not been taught Pythagorus, and therefore would not be expected to know it - I don't think he can do the calculation without it! Am I missing something?
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Still no feedback? Fire that teacher.
12:24 Thu 26th Feb 2009

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