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give me all formulae of area related circle

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Circumference of a circle = $2\pi r$ .
Area of a circle = $\pi r^2$ .
The area of a sector of a circle with radius $'r'$ and angle with degree measure $\theta$ is $\frac{\theta }{360}\times \pi r^2$ .
Length of an arc of a sector of a circle with radius $'r'$ and angle with degree measure $\theta$ is $\frac{\theta }{360}\times 2\pi r$ ⋅
Area of the segment of a circle= Area of the corresponding sector – Area of the corresponding triangle.

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