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Question:

2 cubes each of volume 64 cm³ are joined end to end. Find the surface area of the resulting cuboid.

Solution:

Given:⇒Volume of cubes = 64cm³⇒(Edge)³=64⇒Edge=4cm
If cubes are joined end to end, the dimensions of the resulting cuboid will be 4cm, 4cm, 8cm.
Surface area of cuboids=2(lb+bh+lh)=2(4×4+4×8+4×8)=2(16+32+32)=2(16+64)=2(80)=160cm²