Circumference 27581

The rotating cone has a base circumference of 62.8 cm. And a height of 0.7 dm. Calculate its surface area and volume.

Correct answer:

S =  6.97 dm2
V =  0.7323 dm3

Step-by-step explanation:

o=62.8 cm dm=62.8:10  dm=6.28 dm h=0.7 dm  o = 2 π r  r=o/(2π)=6.28/(2 3.1416)0.9995 dm  S1=π r2=3.1416 0.999523.1384 dm2  s=r2+h2=0.99952+0.721.2202 dm  S2=π r s=3.1416 0.9995 1.22023.8316 dm2  S=S1+S2=3.1384+3.8316=6.97 dm2
V=31 S1 h=31 3.1384 0.7=0.7323 dm3

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