Lara needs to split 4 square yards of fabric into 7 equal sections. Three of these expressions give the amount of fabric each se
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Just work with it as seperate triangles and then add them up.
Check the picture below.
so to find the surface area of the triangular prism, we simply add the areas of each of the figures composing it, as you can see is really just 2 triangles an 3 rectangles.
now, to get the volume is simply the area of the triangular face times the length, well, we know the area of one of the triangles is 6, times 10 is just 6*10 = 60.
