Chapter 10 Vocabulary - Properties of Circles
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| center of a circle | see circle
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| central angle | an angle whose vertex is the center of the circle
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| chord | a segment whose endpoints are on a circle
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| circle | the set of all points in a plane that are equidistant from a given point called the center of the circle
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| circumscribed circle | the circle that contains the vertices of an inscribed polygon
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| congruent arcs | two arcs that have the same measure and are arcs of the same circle or of congruent circles
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| congruent circles | two circles that have the same radius
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| diameter of a circle | a chord that passes through the center of a circle; the distance across a circle through its center
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| external segment | the part of a secant segment that is outside the circle
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| inscribed angle | an angle whose vertex is on a circle and whose sides contain chords of the circle
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| inscribed circle | a polygon whose vertices all lie on a circle
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| intercepted arc | the arc that lies in the interior of an inscribed angle and has endpoints on the angle
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| major arc | part of a circle that measures between 180 degrees and 360 degrees
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| measure of a major arc | the difference between 360 degrees and the measure of the related minor arc
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| measure of a minor arc | the measure of the arc's central angle
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| minor arc | part of a circle that measures less than 180 degrees
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| radius | a segment whose endpoints are the center of the circle and a point on the circle; the distance from the center of a circle to any point on the circle; plural radii
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| secant line | a line that intersects a circle in two points
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| secant segment | a segment that contains a chord of a circle and has exactly one endpoint outside the circle
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| segments of a chord | when two chords intersect in the interior of a circle, each chord is divided into two segments called segments of the chord
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| semicircle | an arc with endpoints that are the endpoints of a diameter of a circle; the measure of a semicircle is 180 degrees
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| standard equation of a circle | the standard equation of a circle with center (h, k) and radius r is (x - h) squared + (y - k) squared = r squared
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| tangent line | a line in the plane of a circle that intersects the circle in exactly one point, the point of tangency
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