1. Total surface area of a cube is 486 sq cm, find sum of length of all its edges?
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By: anil on 05 May 2019 02.15 am
Let the side of the cube = $$a$$ cm Total surface area of cube = $$6a^2 = 486$$ => $$a^2 = frac{486}{6} = 81$$ => $$a = sqrt{81}=9$$ cm Number of edges in a cube = 12 $$ herefore$$ Sum of all edges = $$12 imes 9 = 108$$ cm => Ans - (B)
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