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Formulas of radius, diameter, perimeter and area of mathematical circles and semicircles
S circle = π× (square of radius)

S sector =(N×π× radius square) /360 (N is the degree of central angle, and the semicircle is 180).

C circle =2×π× radius

C arc =(N×π× radius)/180 (N is the degree of central angle, and the semicircle is 180).