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Worksheets perimeter surface prismPrism prisms grade 99worksheets math Surface area rectangular prism worksheets softschools worksheet findSurface area of rectangular prism worksheet pdf. 144. The surface area formula for a triangular prism is 2 * (height x base / 2) + length x width 1 + length x width 2 + length x base, as seen in the figure below: A triangular prism is a stack of triangles, so the usually triangle solving rules apply when calculating the area of the bases. Grade 6 and grade 7 students decompose the L-shaped rectangular prisms in these printable surface area of non-overlapping rectangular prism worksheets, add the SA of each solid shape and minus the area of the attached parts. 5 yd 4 yd 6). Round your answers to the nearest whole, if necessary. Solution: As we know, Total Surface Area (TSA) = 2 (lw + wh + hl) , here l = 15 m, w = 7 m, h = 5 m. 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