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# More Circles

Define: Chord A segment whose endpoints lie on a circle.
Define: Secant A line that intersects a circle at two points.
Define: Tangent A line in the exact same plane as a circle that intersects it at exactly one point.
Define: Point of Tangency The point where the tangent and a circle intersect.
Define: Congruent Circles Circles that have congruent radii.
Define: Concentric Circles Coplanar circles with the same center.
Define: Tangent Circles Two coplanar circles that intersect at exactly one point.
Define: Common Tangent A line that is tangent to two circles
A line that is tangent to a circle is ________ to the radius. Perpendicular
Define: Central Angle An angle whose vertex is the center of a circle.
Define: Arc An unbroken part of a circle consisting of two points called the endpoints and all the points on the circle between them.
Define: Minor Arc An arc whose points are on or in the interior of a central angle.
Define: Major Arc An arc whose points are on or in the exterior of a central angle.
Define: Semicircle An arc that's endpoints lie on a diameter.
Define: Adjacent Arcs Arcs of the same circle that intersect at exactly one point.
"In a circle if a radius (or diameter) is perpendicular to a chord
Define: Sector of a Circle A region bounded by two radii of the circle and their intercepted arc.
What is the equation for the area of a sector and/or segment? A=πr^2 (m°/360°)
Define: Segment of a Circle A region bounded by an arc and its chord.
Define: Arc Length The distance along an arc measured in linear units.
What is the equation for arc length? L=2πr(m°/360°)
Define: Inscribed Angle An angle whose vertex is on a circle and whose sides contain chords of the circle.
Define: Intercepted Arc An arc consisting of endpoints that lie on the sides of an inscribed angle and all the points of the circle between them.
Define: Secant Segment A segment of a secant with at least one endpoint on the circle.
Define: External Secant Segment A secant segment that lies in the exterior of the circle with one endpoint on the circle.
Define: Tangent Segment A segment of a tangent with one endpoint on the circle.
What is the equation of a circle? (x-h)^2 + (y-k)^2 = r^2
Define: Radius A line segment from the center of a circle to the circumference.
Define: Diameter A chord that contains the center of a circle.
Created by: Alison.Rector