Hi everyone again! My question is as follows in full:

Sketch and find the area of the inner curve.

Ok, this is a cardioid [according to my book], and my graphing by sketch looks like (couldn't scan so this is an actual graph courtesy of desmos.)

I'm supposed to find the area of the curve from to and when goes from ?? This is where I get stuck. To find where , that is, where the curve is at O and a tangent there, I need two values for but I can only find one, which logically makes two because both the plus and minus of the absolute value of that value should apply.

The value I found is which converting to radians I take to be . If I apply this number backwards from [tex]\pi[\tex], I can't seem to get the correct value. I seem to be getting the whole sector. Some help here please?

Thanks in advance!