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Question

Side of a cube is 4.5 cm. Find the surface area of all vertical faces and total surface area of the cube.


Solution


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.

Mathematics
Mathematics Part - II (Solutions)
Standard IX

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