What is the area of a circle? The answer is A=πr2, but I want you to show the work.
1 answer:
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I think you mean to say 
. If 
is in the third quadrant, then 
and 
. Recall that
We expect
to be negative, so we take the negative root. We end up with
We also know to expect, so
By definition, we have
and so
We expect
We also know to expect
By definition, we have
and so