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| Question | Answer |
| Chord | A line with each of its endpoints on a point on the circle |
| Diameter | A chord that passes through the center of the circle |
| Secant of a circle | A line that intersects a circle at exactly two points |
| Tangent | A line that intersects a circle at exactly one point |
| Point of tangency | Point of intersection where a line intersects a circle at exactly one point |
| Radius | The distance from a point on the circle to the center |
| Central angle | An angle whose vertex is the center of the circle |
| Inscribed angle | An angle whose vertex is on the circle |
| Arc | Any unbroken part of the circumference of a circle (named using two endpoints) |
| Major arc | The largest arc formed by a secant and a circle (more than halfway around the circle) |
| Minor arc | The smallest arc formed by a secant and a circle (less than halfway around the circle) |
| Semicircle | Exactly half of a circle |