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Calculate the total surface area of the outside of an open box which has a base measuring 1.0 by 0.8m and has a height of 0.5m.plz answer fast.....very urgent!!!!!!!

Answer»

An open box means it's TOP SURFACE is not there. So the TOTAL surface area is the SUM of lateral surface area and bottom surface area.

LSA = 2(lh+bh) = 2(1×0.5 + 0.8×0.5) = 2(0.5 + 0.4) = 1.8 m²
bottom surface area = 1×0.8 = 0.8m²

TSA = 1.8+0.8 = 2.6 m²



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