1.

The sum of the length, breadth and the height of a cubold is `5sqrt(3)` cm and length of its diagonal is `3sqrt(5(` cm. Find the tatal surface area of the cuboid.A. `30cm^(2)`B. `20cm^(2)`C. `15cm^(2)`D. `18cm^(2)`

Answer» (i) Use suitable algebraic identity to find the LSA of the cuboid.
(ii) `l+b+h=5sqrt(3 ) and l^(2)+b^(2)+h^(2)=3sqrt(5).`
(iii) Square the first equation and evaluate `2(lb+bh+hl)`.


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