Seek Earth's Geography in Alg-Geometry

Geometry Level 3

Consider a semicircle with radius rr and a point PP on its circumference such that PA+PBPA + PB is maximum.

Then, find the area of the blue region if r=6370r=6370. (Radius of earth is 6370 km)

Use the approximation π=227\pi = \dfrac{22}{7}.

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