© Gina Wil

Notes

© Gina Wilson (All Things Algebra®, LLC). 2015-2019 | PARTS OF CIRCLES DICTIONARY | | | | --- | --- | --- | | Term | Definition | Example or Visual | | CIRCLE | The set of points equidistant from a given point (the center). | | | RADIUS | A segment with endpoints at the center and on the circle. | | | CHORD | A segment with endpoints on the circle. | | | DIAMETER | A chord that passes through the center. (Diameter = 2 radius) | | | SECANT | A line that intersects the circle in two places. | | | TANGENT | A line that intersects the circle at exactly one place. | | | POINT OF TANGENCY | The point at which the tangent line intersects the circle. | | | CENTRAL ANGLE | An angle with a vertex at the center, and two sides that are radii. | | | --- | --- | --- | | INSCRIBED ANGLE | An angle with a vertex on the circle, and two sides that are chords. | | | ARC | A portion of the edge of the circle defined by two endpoints. Symbol: ∩ | | | MINOR ARC | An arc with a measure less than 180°. *use 2 letters to name it! | | | MAJOR ARC | An arc with a measure greater than 180°. *use 3 letters to name it! | | | SEMICIRCLE | An arc with endpoints on th...