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Mathematics
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the surface are of a triangular prism with dimensions of height-5 cm length 21 cm width-6 cm
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|dw:1383115969086:dw|
lol
so break it into parts, we have two triangles and 3 rectangles, ya?
the bottom one is easy, 21*6 the two slanted rectangles are hard so are the two trianles on the ends. so we'll start with the triangles on the end.
|dw:1383116252288:dw|
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