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(0/2) x r^2

∅ the angle in radians subtended by the arc at the centre of the circle.

R- radius

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n degrees/ 360 degrees X 2πr

n- degree
π-pie
r-radius

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Standard form of the equation of a circle

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Standard form of the equation of a circle

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(x – h)² + (y – k)² = r2

h,k- center
r^2- radius squared
x and y- coordinate

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A=πr^2

A=Area
π- 3.14(pie)
r^2- radius squared

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Formula- C=2πr
π- 3.14
R- radius
C- Circumference

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inscribed angle is an angle formed by two chords in a circle which have a common endpoint.

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Central angles are subtended by an arc between those two points, and the arc length is the central angle of a circle of radius one. The central angle is also known as the arc's angular distance.

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a semicircle is a one-dimensional locus of points that forms half of a circle.

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is an arc of a circle having measure greater than or equal to ( radians).

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is an arc of a circle having measure less than or equal to ( radians).

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an arc is a closed segment of a differentiable curve.

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portion of a disk enclosed by two radii and an arc, where the smaller area is known as the minor sector and the larger being the major sector.

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a secant of a curve is a line that (locally) intersects two points on the curve.

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A chord of a circle is a straight line segment whose endpoints both lie on the circle.

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-tangent line to a circle is a line that touches the circle at exactly one point, never entering the circle's interior.

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A straight line from the center to the circumference of a circle or sphere.

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a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.

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- A round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).