1.

Three solid cubes of sides 1 cm, 6 cm and 8 cm are melted to form a new cube. Find the surface area of the cube so formed.

Answer»

Volume of new cube = (13 + 63 + 83 ) cm3 = 729 cm3

Edge of new cube = 3729 cm = 9 cm. 

Surface area of the new cube = (6 x 9 x 9) cm2 = 486 cm2 . 



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