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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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LESSON A: DEFINING CIRCLES & THEIR PARTS

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