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a fractional part of the area of the entire circle

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

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A central angle is an angle whose apex (vertex) is the center O of a circle and whose legs (sides) are radii intersecting the circle in two distinct points A and B.

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a half of a circle or of its circumference.

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

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a segment of the circumference of the circl

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A sector of a circle is a pie shaped portion of the area of the circle.  Technically, the piece of pie is between two segments coming out of the center of the circle.

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the ratio of the hypotenuse to the shorter side adjacent to an acute angle (in a right-angled triangle); the reciprocal of a cosine

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a straight line segment whose endpoints both lie on the circle.

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A line which touches a circle or ellipse at just one point. Below, the blue line is a tangent to the circle c. Note the radius to the point of tangency is always perpendicular to the tangent line.

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In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is the length of any of them.

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any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

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a circle is a closed plane with no corners.