Rotation

The right triangle with legs 11 cm and 18 cm rotate around the longer leg.

Calculate the volume and surface area of the formed cone.

Correct result:

S =  1109.1244 cm2
V =  2280.7963 cm3

Solution:

a=11 cm b=18 cm b>a  r=a=11=11 cm s=a2+b2=112+182=445 cm21.095 cm  S1=π r2=3.1416 112380.1327 cm2 S2=π r s=3.1416 11 21.095728.9917 cm2 S=S1+S2=380.1327+728.9917=1109.1244 cm2
V=13 S1 b=13 380.1327 18=2280.7963 cm3



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