Sunday

December 21, 2014

December 21, 2014

Posted by **Thomas** on Sunday, January 5, 2014 at 4:55pm.

please answer and explain

- math -
**Ms. Sue**, Sunday, January 5, 2014 at 4:57pm162 pi

- math -
**Thomas**, Sunday, January 5, 2014 at 5:01pmmy answer is 162 pi too, but the answer is

a. 18 pi

b. 36 pi

c. 36 pi^2

d. 324 pi

e. 324 pi^2

- math -
**Steve**, Sunday, January 5, 2014 at 6:42pmif a = 81pi, r = 9

if r = 18, c = 36pi

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