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okay and this one were going to find the area of the shaded region and concentric circles so basically youve got two circles here one inside the other those are concentric circles and so let me pull up that whole image and lets say the outside circle is say 60 centimeters or something like that and lets say the inside circle has a radius of 30 centimeters okay so the area of any circle can be found by taking PI R squared and so the area of the big circle would be so maybe well just Ill put a little B down there Ill subscript a B for area of big circle is pi times 60 squared and so that would be 3600 pi because 60 times 60 is 3600 and then the area of the small circle salt area with a little s for small circle because this radius is only 30 is pi times 30 squared oops I missed the third so pi times 30 squared all right and so that one would simplify to 900 pi so to find the area of the shaded region between those you just have to subtract them so in our case itd be the area of t
