# Geometry Circles Vocabulary

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Circles

### Circle

A shape consisting of those points in a plane which are equidistant from a given point called the center.

### Pi (π)

The ratio of the circumference to the diameter of a circle.

A line from the center of the circle of the circle to any point on the circle.

more than 1 radius.

### Chord

A line segment that links 2 points on a circle.

### Diameter

A chord that crosses through the center of the circle.

### Tangent

A line or ray that interests a circle at only 1 point.

### Point of Tangency

The point where a circle and a tangent intersect.

### Arc

Part of a circle with an angle measure.

### Minor Arc

Arc whose measure is smaller than 180 degrees.

### Major Arc

Arc whose measures is larger than 180 degrees.

### Semi-circle

Arc whose measure is equal to 180 degrees.

### Central Angle

An angle whose vertex is a center of a circle.

### Congruent Circles

Circles with congruent radii.

Example:

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