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What is the surface area of the triangular prism below?
We have 2 triangles to add and 3 rectangles. Area of a rectangle is length x width. Area of a triangle is 1/2 x base x height.
The top 2 rectangular sides are 20 x 10 = 200 each = 400 total. The bottom rectangle is 20 x 12 = 240 The triangles are each 1/2 x 12 x 8 = 48, and there are 2 triangles, = 96
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