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Parts of circle
| Term | Definition |
|---|---|
| all points the same distance from a given point | circle |
| the segment that connects the center of a circle to a point on a circle | radius |
| a segment that connects two points on a circle | chord |
| a line that touches a circle twice | secant |
| a line that touches a circle once | tangent |
| a continuous part of a circle | arc |
| an arc that is larger than a semicircle | major arc |
| a chord that goes through the center of a circle | diameter |
| twice the length of a radius | diameter |
| half the length of a diameter | radius |
| an arc that measures 180 degrees | semicircle |
| an arc that measures less than 180 degrees | minor arc |
| circles that have radii that are the same length | congruent circles |
| the point where a tangent touches a circle | point of tangency |
| an angle made with two radii | central angle |
| the middle of a circle | center |
| the part of a secant that is in the circle | chord |
| an arc that is made by the endpoints of a diameter | semicircle |
| half a circle | semicircle |
| the area inside the circle's boundary | interior |
| an arc than measures more than 180 degrees | major arc |
| circles that share a center | concentric circles |
| the area outside the circle's boundary | exterior |
| all points on the circle are equidistant from this | center |
| an arc that is smaller than a semicircle | minor arc |