Find the integrals: 1. The curve y = V4 - x2, -1

Find the integrals: 1. The curve y v/Z7, 1 < 1, is an arc of the circle c2 + Y2 4. Find the area of the surface obtained by rotating this arc about the x-axis. 2. The arc of the parabola y = from (1, 1) to (2, 4) is rotated about the y- axis. Find the area of the resulting surface.