Question: Concern C, the circle r = 2a cos θ, for -π/2 ≤ θ ≤ π/2, of radius a > 0 centered at the point (x, y)=(a, 0) on the x-axis.
1. Find the area of the region enclosed by C and outside the circle of radius a centered at the origin. What percent is this of the area of C?
2. Calculate the arc length of C using polar coordinates.