The Circle and Some Related Terms

Diameter

Diameter

________- A chord that contains the center of the circle.

Arc

________- A portion of a circle where two distinct points on a circle divides the circle into two parts.

Radius

________ is defined as a segment connecting the center with a point on the circle.

Circumscribed Polygon

• The polygon is outside the circle.

Central Angle

________ is an angle in the plane of the circle whose vertex is the center of the circle.

The circle is divided into 3 parts

Exterior, Interior and the circle itself

Circle

The set of all points in a plane at a given distance from a given point.

Major arc, Minor arc and semicircle

3 Classifications of Arcs

Tangent Line

A tangent to a circle is a line, coplanar with the circle that intersects the circle in exactly one point.

Secant Line

A secant line is a line that intersects the circle in two points. It is always composed of a chord.

Inscribed Angle

An angle whose vertex lies on the circles and whose sides contain points of the circle.

Common Tangent

It is a tangent to each of coplanar lines.

Common External Tangent

The line did not intersect the center of the circle