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2015-02-28T14:45:57+05:30

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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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2015-02-28T16:37:19+05:30
Total surface area
1.8+0.8=2.6
t.s.a=2.6

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