Circles and their properties

Glossary:

Arc: Segment of the circumference of a circle. Measures the same angle measurement of its central angle.

Central Angle: Angle created by 2 radii

Chord: A segment from one point of a circle to another point of a circle

Circumference: Perimeter of a circle

Diameter: A segment from one point of a circle to another point of a circle through the center. Longest chord of a circle and twice the radius

Inscribed Angle: An angle with a vertex on a point of the circle

Pi: The ratio of the circumference and diameter of a circle

Radian: An angle measurement of an arc that has a length of the radius

Radius: A segment from the center of a circle to any point on the circle

Sector: portion of the area of a circle

Unit circle: A circle with a radius of 1

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