PleasehelpmeohmygodthisissohardIhavethisonmytest.okaythisquestionmightbe superduperhardsofeastyoureyesohmygodhereitisohnoidontkn
2 answers:
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Check the picture below, so the circle looks more or less like so, with a radius of 9.
That would be 
, but it is also equal to just 
. You would simplify the 
part, and you would get 
, or if you need a decimal, 
But don't forget the negative part, so the answer would be
or 
But don't forget the negative part, so the answer would be