Vocab Group 7: Circles

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Last updated 12:07 PM on 8/5/26
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22 Terms

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Circle

A round plane figure whose boundary consists of points equidistant from a fixed center point.

<p>A round plane figure whose boundary consists of points equidistant from a fixed center point.</p>
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Center

The fixed point from which all points on a circle are equidistant.

<p>The fixed point from which all points on a circle are equidistant.</p>
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Radius

A line segment from the center of the circle to any point on its circumference.

<p>A line segment from the center of the circle to any point on its circumference.</p>
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Diameter

A line segment that passes through the center of the circle and has its endpoints on the circle.

<p>A line segment that passes through the center of the circle and has its endpoints on the circle.</p>
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Chord

A line segment whose endpoints lie on the circle.

<p>A line segment whose endpoints lie on the circle.</p>
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Arc measure

The measure in degrees of an arc's central angle.

<p>The measure in degrees of an arc's central angle.</p>
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Arc

A portion of the circumference of a circle.

<p>A portion of the circumference of a circle.</p>
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Arc length

The distance along the arc between two points on the circle.

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Minor arc

An arc that is smaller than a semicircle.

<p>An arc that is smaller than a semicircle.</p>
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Major arc

An arc that is larger than a semicircle.

<p>An arc that is larger than a semicircle.</p>
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Semicircle

An arc that represents half of a circle.

<p>An arc that represents half of a circle.</p>
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Tangent

A line that touches the circle at exactly one point.

<p>A line that touches the circle at exactly one point.</p>
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Point of tangency

The point at which a tangent line touches the circle.

<p>The point at which a tangent line touches the circle.</p>
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Central angle

An angle whose vertex is the center of the circle and whose sides are radii.

<p>An angle whose vertex is the center of the circle and whose sides are radii.</p>
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Inscribed angle

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

<p>An angle formed by two chords in a circle which have a common endpoint.</p>
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Sector

The region enclosed by two radii and the arc between them.

<p>The region enclosed by two radii and the arc between them.</p>
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Concentric circles

Circles that share the same center but have different radii.

<p>Circles that share the same center but have different radii.</p>
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Congruent circles

Circles that have the same radius.

<p>Circles that have the same radius.</p>
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Circumscribed

A circle that is drawn around a polygon such that all vertices of the polygon lie on the circle.

<p>A circle that is drawn around a polygon such that all vertices of the polygon lie on the circle.</p>
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Cyclic quadrilateral

A quadrilateral whose vertices all lie on a single circle.

<p>A quadrilateral whose vertices all lie on a single circle.</p>
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Secant

A line that intersects a circle at two points.

<p>A line that intersects a circle at two points.</p>
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Circumference

The distance around the circle, calculated as C = 2πr, where r is the radius.

<p>The distance around the circle, calculated as C = 2πr, where r is the radius.</p>