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Geometry 12.1, 12.2, 12.3 vocabulary
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Gravity
Key Concepts:
Terms in this set (25)
Circle
A set of points that are the same distance from the center point
Radius
The distance from center to a point on the circle
Diameter
Distance from one pint on a circle to another through a center point
Chord
Segment whose endpoints lie in a circle
Secant
Line that intersects a circle at two points
Tangent
a line that is in the same plane as a circle and intersects the circle at exactly one point
point of tangency
where the tangent intersects the circle
The same radii
Two circles are congruent if and only if they have _______________
concentric circles
Coplanar circles with the same center
Tangent circles
two coplanar circles that intersect at exactly one point
Common tangent
a line that is tangent to two circles
Perpendicular
If a line is tangent to a circle, then it is _________ to the radius drawn to the point of tangency
Tangent
If the line is perpendicular to the radius of the circle, then the line is ________ to the circle
Congruent
If two segments are tangent to a circle from the same point of the segment are _________
Central angle
angle whose vertex is the center of the circle
Arc
Is an unbroken part of a circle consisting g of two endpoints and all points on the circle between them
Minor arc
Are whose endpoints are on the interior of a central angle
Major arc
Are whose points are on the exterior of central angle
Semicircle
Are whose endpoints are the diameter of a circle
1) Congruent central angles have congruent chords
2) congruent chords have congruent arcs
3) congruent arcs have congruent central angles
In a circle or congruent circles:
Perpendicular
If a radius is _________ to a chord, then it bisects the chord and its arc
Chord
The perpendicular bisector of a ________ is a radius
Sector
the region bounded by two radii of the circle and their intercepted arc
Segment of a circle
A region bounded by an arc and its chord
Arc length
The distance along an arc measure in linear units
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