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September 18, 2014

September 18, 2014

Posted by **danielle** on Monday, May 6, 2013 at 1:03pm.

- Geometry -
**danielle**, Monday, May 6, 2013 at 1:15pmThe surface area of a cone is 16.8pi in squared. The radius 3 in. What is the slant height?

- Geometry -
**Steve**, Monday, May 6, 2013 at 2:33pmfor the volumes, just subtract the smaller from the larger:

π/3 (81)(5) = π/3 (36)(5) = 75π

area = πr(r+s)

16.8π = π(3)(3+s)

5.6=3+s

s=2.6

s cannot be less than r.

Evidently you do not want to include the base of the cone, so

16.8π = πrs

16.8π = 3πs

s = 5.6

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