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
Volume of new cube = 13+63+83cm3= 729cm3
Edge of new cube = 7293 = 9cm
Surface area of the new cube = ( 6 x 9 x 9) sq.cm = 486 sq.cm
Find the surface area (in cm2) of a sphere of diameter 28 cm.
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