Solid solution too!

]]>All = 1/4 * 2 * PI * R^2

SmallHalf =1/2 * 2 * PI *(1/2 * R)^2

-> Red = (1/4 * 2 * PI * R^2) – 2 * (1/2 * 2 * PI *(1/2 * R)^2) + Blue

Red = 1/2 * PI * R^2 – 2 * 1/4 *PI *R^2 + Blue

Red = PI * R * (1/2 – 2/4) + Blue

Red = Blue

Q.E.D.

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