what will it cost to paint the circular roof of a building of radius 4.2cm at the rate of rs 25 per square metre ?
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cost of printing = area × rate
= 22/7 4.2 × 4.2 ×25 = 22× 0.6 × 4.2 × 25
= ₹ 1386
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The cost to paint the circular roof of a building is ₹5544
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