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Ring (area between two circles of radii r1 and r2 ) The circles need not be concentric, but one of the circles must enclose the other. A = π(r1 + r2)(r1 − r2) r1 > r2. Ellipse (Fig. 3-6) Let the semiaxes of the ellipse be a and b. A = πab. C = 4aE(e) where e2 = 1 − b2/a2 and E(e) is the complete elliptic integral of the second kind, π 1 2 ................
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