all formulas of circle
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Area of a circle (A ) = π r 2 =( π/4 ) D2 = 0.7854 D2 ...
Diameter of a circle (D) = √(A/0.7854).
The area of the sector = (θ/2) r 2
Sector angle of a circle θ = (180 x l )/ (π r ).
Perimeter of the segment = (θ π r / 180) + 2r sin (θ/2).
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22/7 ×r2 ,1/2 ×22/7×r,(22/7+2)×r
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