# Math: Circle Definitions

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1. Distance from the center to a point on the circle
2. What is the Plural version of Radius
3. Distance across the circle through its center
Diameter
4. A segment whose endpoints are points on the circle
Chord
5. A line in the plane of a circle that intersects the circle in exactly one point
Tangent
6. A line that intersects a circle in 2 points
Secant
7. If something is a line what do you write over the letters?
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8. If something is a segment what do you draw over the letters?
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9. Coplanar circles that intersect in one point
Tangent circles
10. Consists of the Points that are inside the circle
Internally tangent
11. Consists of the points that are outside the circle
Externally tangent
12. A line or segment that is tangent to 2 coplanar circles
Common tangent
13. Tangent line that hits Inside or between the 2 circles
Common internal tangent
14. Tangent line that hit both circles but on the outside
Common external tangent
15. They both have the same center
Concentric circles
16. Example of a concentric circle?
Bullseye
17. 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
18. What it is the 2nd tangent theorem
If 2 segments from the same exterior point are tangent to the circle then they are congruent
19. Angle whose vertex is theĀ centerĀ of a circle, and whose sides pass through a pair of points on the circle
Central Angle
20. Shortest arc- less than 180 degrees, only 2 letters
Minor Arc
21. Longest arc-3 letters
Major Arc
22. If the end pints of an arc are the endpoints of a diameter
Semicircle
23. The measure of an arc formed by 2 adjacent arcs in the sum of the measures of the 2 arcs