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Class 10 > Learn Mathematics > The diameter of a sphere is 28 cm. Find the cost of...
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The diameter of a sphere is 28 cm. Find the cost of painting it all around at Rs. 0.10 per square cm.

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Diameter 28 cm. so radius 14 cm Surface area = 4/3 x 22/7 x 14 x 14= 821.33 sq cm Cost of painting 821.33 x 0.10 = Rs 82.13 Ans
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Diameter=14 ,radius=14 circumference=2πr=2×,22/7×14=88cms. Cost=88×.10=8.8rs
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Tutor

CosA=√3/2.
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HCF=13
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d=28cm so r=d/2=28/2=14cm Now Area of sphere is, 4πr^2=4*3.14*14^2=2463cm^2 Cost=area*cost of per sq. cm=2463*0.10=Rs 246.3
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Diameter of sphere is14 , so, radius=14 , Circumference=2?r=2×22/7×14=88cms. Cost=88×0.10Rs=8.8 Rs
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