63. 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.
A.864m B. 486cm2
C.846 Cm2 D. None
Answer:
Volume of new cube = (13 + 63 + 83) cm+ = 729 cm3.
Edge of new cube = 3Ö729 cm = 9 cm. Surface area of the new cube = (6 x 9 x 9) cm2 = 486 cm2.
