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# A chord that goes through the center of a circle

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A chord that goes through the center of a circle
diameter

Common external tangent
A line that is tangent to more than one circle but does not cross between the circles Common external tangent

A segment from the center of a circle to any point on the circle
radius

A line that intersects a circle in two separate points.
secant

A line that intersects a circle in only one point
tangent

The point where a tangent intersects a circle
Point of tangency

Common internal tangent
A line that is tangent to more than one circle and crosses in between the two circles. Common internal tangent

Externally tangent circles
Circle that intersect in only one point and have no other points in common Externally tangent circles

Circles with the same center but differing radii
Concentric circles

Internally tangent circles
Circles that intersect in only one point with one circle inside of the other (sharing interior points) Internally tangent circles

An angle whose vertex lies on the circle
Inscribed angle

An arc measuring less than 180°
Minor arc

An arc whose endpoints lie on a diameter of a circle
semicircle

Find x 110° 120° A B AB is a diameter X = 60° X = 70°

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