Alternatively if one knows r=sin(theta) and r=sin(theta) are the circles with radius 0.5 and 1 and area of circle is Pi r^2, then its just Pi (1^2-0.5^2) = 3/4 Pi.
I had and I would still love a great storytelling. :D
Hit '5' and think about "1 girl 1 cup"
Talk about things you learn ... I learned that one can move YouTube subtitles.