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April 19, 2014

April 19, 2014

Posted by **dan** on Tuesday, March 15, 2011 at 12:09am.

- math -
**Anonymous**, Tuesday, March 15, 2011 at 12:58amRadius of smaller circle: a-18 (inchs)

Radius of larger circle: a (inchs)

Circumference of smaller circle:

2*pi*(a-18)=2*pi*a-2*pi*18=2*pi*a-36*pi (inchs)

Circumference of larger circle:

2*pi*a (inchs)

Difference betwen ircumference of smaller and large circle:

D=2*pi*a-(2*pi*a-36pi)=

2*pi*a-2*pi*a+36pi=

36*pi (inchs)

D=36*pi (inchs)

1feet=12 inchs

D=(36*pi)=(3*pi)ft

D=(A*pi)

A*pi=3*pi Divide with pi

A=3

- math -
**Anonymous**, Tuesday, March 15, 2011 at 1:00amD=(36*pi)in=(3*pi)ft

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