1.

A solid cube has side 8 cm. It is cut along diagonals of top face to get 4 equal parts. What is the total surface area (in cm2) of each part?1). 96 + 64√22). 80 + 64√23). 96 + 48√24). 80 + 48√2

Answer»

Total SURFACE area of a part = Area of one face of the cube + 2 × 1/4 × Area of TOP face + 2 × (SIDE of cube) × (1/2 × face DIAGONAL)

⇒ 8 × 8 + 1/2 × 64 + 2 × 8 × ½ × 8√2

⇒ 64 + 32 + 64√2

⇒ 96 + 64√2


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