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Posted by **Mary** on Wednesday, May 25, 2011 at 8:59am.

These are my choices:

a. 100rr sq cm

b. 50rr sq cm

c. 25rr sq cm

d. 0 sq cm

I came up with 100rr sq cm??

- Geometry -
**Keisha**, Wednesday, May 25, 2011 at 9:12amJESUS

- Geometry -
**Reiny**, Wednesday, May 25, 2011 at 9:14ambig cylinder = 2π(5^2) + 2π(5)(20) = 300π

smaller = 2π(5^2) + 2π(5)(10) = 200π

but we have two of those, so the new surface area is 400π

difference is 100π

you are correct is the "rr" is supposed to be π

- Geometry -
**Cody**, Wednesday, May 15, 2013 at 1:59pmA cylinder has a height of 16 cm and a radius of 5 cm. A cone has a height of 12 cm and a radius of 4 cm. If the cone is placed inside the cylinder as shown, what is the volume of the air space surrounding the cone inside the cylinder? (Use 3.14 as an approximation of .)

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