Math

• A CIRCLE is the set of all points in a plane that are equidistant from a given point.
• The CENTER of a circle is the point in a plane from which all points on the circle are equidistant.
• A line segment from the center of the circle to any point on the circle is a RADIUS of the circle.
• The term radius may also refer to the length of a segment whose endpoints are the center of a circle and any point on the circle.
• All radii ( plural of radius ) of a circle have equal lengths.
• A circle is named using its center.
• A CHORD of a circle is a line segment with endpoints lying on the circle.
• A DIAMETER of a circle is a chord that passes through the center of the circle. Also, diameter is the longest chord in a circle.
• The CIRCLE is the set of all points on the circle whose distance from the center of the circle is the radius.
• The INTERIOR of a circle is the set of all points in the plane whose distance from the center of the circle is less than the radius.
• The EXTERIOR of a circle is the set of all points in the plane whose distance from the center of the circle is greater than the radius.
• A CENTRAL ANGLE is an angle whose vertex is the center of a circle.
• When a central angle intersects a circle, the part of the circle between the points of intersection is called the intercepted arc.
• The ARC of a circle consists of two points and all other points on the circle that lie between the two given points.
• The ARC MEASURE is the degree measure of the central angle that intercepts the arc.
• ARCS with the same measure are congruent arcs.
• Minor Arc - ar that measures less than 180°
• Major Arc - arc that measures greater than 180°
• Semicircle - arc that is half of a circle
• Arc Length - the distance along an arc
• An inscribed angle is an angle formed by two chords intersecting at a point on a circle.