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Geometry Definitions
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Gravity
Terms in this set (26)
Circle
the set of all points in a plane equidistant from a given point
Radius
line segment from the center to a point on the edge of a circle
Diameter
line segment that contains the center point and with endpoints on the circle; the longest possible chord of a circle
Congruent Circles
circles with the same radius (radii that are congruent or equal in measure)
Concentric Circles
co-planar circles that share the same center
Arc of a Circle
two points on the circle and the continuous part of the circle between the two points
Endpoints
two points at the ends of a segment or arc
Semicircle
arc of a circle whose endpoints are the endpoints of the diameter
Minor Arc
arc of a circle that is smaller than its semicircle (less than 180 degrees) and can be named with two points
Major Arc
arc of a circle that is larger than its semicircle (more than 180 degrees and less than 360 degrees) and must be named with at least three points
Center Angle
angle with vertex at center of the circle and sides passing through the endpoints of the arc
Arc Measure
degree measurement of the arc, the measurement correlates with the central angle
Chord
line segment whose endpoints lie on the circle
Tangent
line that intersects the circle at one point (and only one point) NOTE: a line, not a segment
Point of Tangency
point where the tangent line or segment intersects the circle
Inscribed Angle
angle with vertex on the circle and its sides are chords
Secant
line containing a chord of a circle; or line that intersects a circle in two points
Intercepted Arc
arc between two points on a circle; if major arc it is named by three points
Tangent Segment
line segment that is tangent to a circle
Circumference
perimeter of a circle; found by multiplying the measurement of the diameter and pi
Arc Length
length of an arc; measured by the fraction of the intercepted circumference
Center
point equidistant from all points on a circle; used to name the circle
Common Tangent
a line, ray, or segment that is tangent to two co-planar circles (Internal and External)
Congruent Arcs
two arcs with the same measure on the same or congruent circles
Sector
region bounded by two radii of a circle and its intercepted arc
Adjacent Arcs
two arcs of the same circle with a common endpoint
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