The radius of a sector is twice that of a circle, and the sector area is equal to the circle area
Let the center angle of the sector circle be a and the radius be 2R; if the radius of the circle is r, we can get: (A / 360) * π * (2R) ^ 2 = π, let the sector radius be r and the radius of the circle be r, and the radius of the sector is equal to twice the radius of a circle
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