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A chord that goes through the center of a circle
diameter
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Common external tangent
A line that is tangent to more than one circle but does not cross between the circles Common external tangent
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A segment from the center of a circle to any point on the circle
radius
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A line that intersects a circle in two separate points.
secant
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A line that intersects a circle in only one point
tangent
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The point where a tangent intersects a circle
Point of tangency
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Common internal tangent
A line that is tangent to more than one circle and crosses in between the two circles. Common internal tangent
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Externally tangent circles
Circle that intersect in only one point and have no other points in common Externally tangent circles
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Circles with the same center but differing radii
Concentric circles
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Internally tangent circles
Circles that intersect in only one point with one circle inside of the other (sharing interior points) Internally tangent circles
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An angle whose vertex lies on the circle
Inscribed angle
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An arc measuring less than 180°
Minor arc
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An arc whose endpoints lie on a diameter of a circle
semicircle
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Find x 110° 120° A B AB is a diameter X = 60° X = 70°
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