| Term | Definition |
|---|
| apothem | perpendicular line segment from a polygon's center to one of its sides |
| equal arcs | in a circle, equal chords have |
| arc addition postulate | if c is on ab, then mac + mcb = mACB |
| equal | all radii of a circle are |
| diameter | chord that contains the center |
| bisects the chord | if a line through the center of a circle is perp. to a chord, it also |
| perpendicular to the chord | if a line through the center of a circle bisects a chord that is not a diameter, it is also |
| the center of the circle | the perpendicular bisector of a chord contains |
| it is perpendicular to the radius drawn to the point of contact | if a line is tangent to a circle |
| tangent to the circle | if a line is perpendicular to a radius at its outer endpoint, it is |
| equal | inscribed angles that intercept the same arc are |
| a right angle | an angle inscribed in a semicircle is |
| equal | the tangent segments to a circle from an external point are |
| p = number of sides times side length | perimeter of a polygon |
| a = .5 times n times a times s | area of a polygon |
| m/360 times pi times r squared | area of a sector |
| sector | region enclosed by 2 radii of a circle and an arc |
| segment | region enclosed by an arc of a circle and a chord |
| m/360 times 2 times pi times r | length of an arc |
| area of sector minus triangle | area of segment |
Combine with other sets
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