###
Inscribed Polygon

A polygon is inscribed in a circle if and only if every vertex of the polygon lies on the circle.

###
Tangent

In a plane, a line that intersects a circle at exactly one point.

###
Secant

A line that intersects a circle in two points.

###
Secant Segment

A segment that contains a chord of a circle.

###
Chord

A segment of a circle whose endpoints are on the circle.

###
Point of Tangency

The point of intersection of a line and a circle in exactly one point.

###
Intercepted Arc

An angle intercepts an arc if and only if each of the following conditions holds: 1) the endpoints of the arc lie on the angle.

2) All points of the arc, except the endpoints, are in the interior of the angle.

3) Each side of the angle contains an endpoint of the arc.

###
External Secant Segment

The part of a secant segment that lies outside of the circle.

### Please allow access to your computer’s microphone to use Voice Recording.

## We can’t access your microphone!

### Click the icon above to update your browser permissions and try again

Example:

### Reload the page to try again!

Reload

## Press Cmd-0 to reset your zoom

## Press Ctrl-0 to reset your zoom

### It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

## Your microphone is muted

### For help fixing this issue, see this FAQ.