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# FOCA_9.3

### Vocabulary for FOCA_9.3

TermDefinition
arc length The distance between the endpoints along an arc measured in linear units.
radian A unit for measuring angles. 180° = π radians, and 360° = 2π radians. The number of radians in an angle equals the number of radii it takes to measure a circular arc described by that angle. 360° equals 2π radians because a complete circular arc has length equal to 2π times the radius.
central angle An angle that intersects a circle in two points and has its vertex at the center of the circle.
radius In a circle, any segment with endpoints that are the center of the circle and a point on the circle.
diameter In a circle, a chord that passes through the center of the circle.
Created by: mtoepper