HELP WILL MEDAL AND FAN!
Find the area of the circle: Inner radius is 4cm, Outer radius is 9cm.

HELP WILL MEDAL AND FAN!
Find the area of the circle: Inner radius is 4cm, Outer radius is 9cm.

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Here are the options.
A) 78.5cm^2
B) 31.4cm^2
C) 157cm^2
D) 204.1cm^2

are you trying to find the area of region between below two circles ?
|dw:1440600185673:dw|

Note the area for a circle is \[A_{circle} = \pi r^2\]

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