The rotating

The rotating cone has a height of 0.9 m and the diameter of the base is 7.2 dm. Calculate the surface of the cone. (Hint: use Pythagorean theorem for a side of cone)

Correct answer:

S =  150.3436 dm2

Step-by-step explanation:

h=0.9 m dm=0.9 10  dm=9 dm D=7.2 dm  r=D/2=7.2/2=185=3.6 dm  S1=π r2=3.1416 3.6240.715 dm2  s=h2+r2=92+3.629.6933 dm  S2=π r s=3.1416 3.6 9.6933109.6286 dm2  S=S1+S2=40.715+109.6286=150.3436 dm2

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