write the formula for surface area of cube with one side open. (Side =a)
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Surface area of cube= tsa of cube - a2
= 6a2-a2
= 5a2
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S = a
S. A. of cube with one side open = 6 (s×s) - (s×s)
S. A. of cube with one side open = 6 (s×s) - (s×s) = 5 (s×s)
S. A. of cube with one side open = 6 (s×s) - (s×s) = 5 (s×s) = 5 (a×a) [ s=a]
= 5a square
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