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प्रश्न
Side of a cube is 4.5 cm. Find the surface area of all vertical faces and total surface area of the cube.
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उत्तर
Side of the cube, l = 4.5 cm
∴ Surface area of all vertical faces of the cube = 4l2
= 4 × (4.5 cm)2
= 4 × 20.25 cm2
= 81 cm2
Also,
Total surface area of the cube = 6l2
= 6 × (4.5 cm)2
= 6 × 20.25 cm2
= 121.50 cm2
Thus, the surface area of all the vertical faces and total surface area of the cube is 81 cm2 and 121.50 cm2, respectively.
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