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GEOMETRY
STUDY TIME CIRCLES
21
Mathematics
9th Grade
05/25/2015

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Cards

Term
CIRCLE
Definition
The collection of all points on a plane equal distance from the center
Term
Sphere
Definition
The collection of all points in a space equal distance from the center
Term
Radius
Definition
A segment from the center to a point a on circle
Term
Chord
Definition
A segment connecting two points on a circle
Term
Diameter
Definition
The longest Chord
Term
Tangent
Definition
A line that intersects a circle in one point called the point of tangency
Term
Secant
Definition
A line that intersect a circle in two points
Term
Central Angle
Definition
An angle whose vertex is at the center of the circle
Term
Inscribed Angle
Definition
An angle whose vertex is on the circle
Term
Conngruent Circles
Definition
Circles with = Radii
Term
Concentric Circles
Definition
Circles with the same center
Term
Inscribed Polygon
Definition
A polygon with sides that are Chords
Term
Circumscribed Polygon
Definition
A polygon with sides that are tangents
Term
Diameter
Definition
= Two Radii/ C=ΠD/ A=ΠR²
Term
Arc
Definition
Part of a circle
Term
Major Arc
Definition
Arc greater than 180
Term
Minor Arc
Definition
An Arc less than 180
Term
semicircle
Definition
half of a circle = to 180
Term
common tangent
Definition
a line that is a tangent to two coplanar circles
Term
external tangent
Definition
does not intersect the segment joining the centers of the two circles
Term
internal tangent
Definition
intersects the segment joining the centers
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