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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 \[A_{circle} = \pi r^2\]

|dw:1440600531344:dw| so like this

Yes except colored all the way in the ring part.

|dw:1440600652512:dw|

Show off!

definitely! ;)

Yes the bottom one looks like it.

there is a little trick to get that black area

do u remember how to find area of full circle ?

Nope.

you will need to know that before attempting this problem

lets do a quick problem maybe

Find area of region interior to below circle of radius 3 units :
|dw:1440600874779:dw|

How do I set this up?

there is a direct formula
look up in ur notes/google for "area of circle"

Also you can scroll up, I mentioned it above :P

So I would multiply 4cm and 9cm by 3.14r1 and 3.14r2?

r is the radius

I know, so what do I do first.

You just have to plug it into the formula \[A = (4)^2\pi\]

And do the same for the r = 9 then subtract it from your area with r = 4

Thank you I figured it out!

Yw