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Distance from the center to a point on the circle
Radius

What is the Plural version of Radius
Radii

Distance across the circle through its center
Diameter

A segment whose endpoints are points on the circle
Chord

A line in the plane of a circle that intersects the circle in exactly one point
Tangent

A line that intersects a circle in 2 points
Secant

If something is a line what do you write over the letters?
<>

If something is a segment what do you draw over the letters?


Coplanar circles that intersect in one point
Tangent circles

Consists of the Points that are inside the circle
Internally tangent

Consists of the points that are outside the circle
Externally tangent

A line or segment that is tangent to 2 coplanar circles
Common tangent

Tangent line that hits Inside or between the 2 circles
Common internal tangent

Tangent line that hit both circles but on the outside
Common external tangent

They both have the same center
Concentric circles

Example of a concentric circle?
Bullseye

What is the 1st tangent theorem?
If a line is tangent to a circle then it is perpendicular to the radius drawn to the point of tangency

What it is the 2nd tangent theorem
If 2 segments from the same exterior point are tangent to the circle then they are congruent

Angle whose vertex is theĀ centerĀ of a circle, and whose sides pass through a pair of points on the circle
Central Angle

Shortest arc less than 180 degrees, only 2 letters
Minor Arc

Longest arc3 letters
Major Arc

If the end pints of an arc are the endpoints of a diameter
Semicircle

The measure of an arc formed by 2 adjacent arcs in the sum of the measures of the 2 arcs
Arc Addition Postulate

