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involving central angles, chords, arcs, tangents, and radii.
central angles, chords, and arcs.
of central angles, chords, and arcs.
problems using the radius-tangent theorem and its.
© Edgenuity, Inc.2
Words to Know
Fill in this table as you work through the lesson. You may also use the glossary to help you.
arc of a circlea part of a between two given endpointscentral anglean angle whose vertex is at the of a circle and whose sides are of that circlechorda segment with both on a circlepoint of tangencythe point of intersection between a circle and its radiusa that extends from the center of a circle to any point on the circletangenta line, line segment, or that intersects a circle at exactly one and contains no points inside the circle
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Central Angles and Arc Measures
is an angle whose vertex is at the centerof a circle and whose sides are
of that circle. •In circle
, , and
are all radii of the circle.The degree measure of an
arc of a circle
is equal to the degree measure of the central angle that intercepts it.•One central angle of circle
. •It’s a central angle, because its vertex
is at the center, and sidesand
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