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प्रश्न
A cubical container of side 6.5 m is to be painted on the entire outer surface. Find the area to be painted and the total cost of painting it at the rate of ₹ 24 per m2
उत्तर
Side of a cube (a) = 6.5 m
Total surface area of the cube = 6a2 sq.units
= 6 × 6.5 × 6.5 sq.m
= 253.50 sq.m
Cost of painting for 1 sq.m = ₹ 24
Cost of painting for 253.5 sq.m = 253.5 × 24
= ₹ 6084
∴ Area to be painted = 253.50 m2
Total cost of painting = ₹ 6084
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