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The area of the base of the cone is 81π square millimeters, and the area of the lateral surface is 135π square millimeters.Find the radius r and slant height ℓ of the cone.

 

r =  __mm

ℓ = ___ mm

 

Guest Sep 23, 2018
 #1
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Base area = Pi x r^2
81Pi =Pi x r^2
r =Sqrt(81) = 9 mm - the radius of the cone.
Lateral Surface Area=Pi x r x s
135Pi=Pi x 9 x s
s =135 / 9
s = 15 mm - slant height of the cone.

Guest Sep 24, 2018
 #2
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Thanks 

Guest Sep 24, 2018

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