Circle Geometry Vocabulary

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Arc Length

A fraction a a circle's circumference. The product of the ratio [measure of the arc]/360 and circumference

Perpendicular bisector

A line that cuts another line in half at right- angles to it.

secant

A line that intersects a a circle at two points (it contains a chord).

Segment of a Circle

A part of a circle bounded by an arc and the segment joining its endpoint.

Tangent

A straight line that touches the circle at a single point.

Inscribed Angle

An angle formed by two chords whose vertex lies on the circumference of the circle

Central Angle

An angle whose vertex is at the centre of a circle

central angle

An angle whose vertex is the center of the circle

major arc

An arc of a circle whose points are on or in the exterior of a central angle

minor arc

An arc of a circle whose points are on or in the interior of a central angle

Arc

Any section the circumference of a circle.

Radius

Any straight line from the center of a circle to its circumference.

Chord

Any straight line linking two points on a circle`s circumference, but not passing through its center.

semicircle

Half of a circle

Area

The amount of space inside a circle`s circumference.

point of tangency

The point where a circle and a tangent intersect

Circle

The set of all points equidistant from a given point called the center

circumference

The total length of the outside edge (perimeter) of a circle.

Congruent

To have the same size, shape, and measure.

sector

a region bounded by an arc of the circle

inscribed in a circle

all the sides of the polygon are tangent to the circle in the polygon.

intercepted arc

an arc whose endpoints are on the sides of an inscribed angle, and its other points in the interior of the angle.

Pythagorean Theorem

a²+b²=c²

inscribed quadrilateral

is any four sided figure whose vertices all lie on a circle.

Diameter

the distance measured from one point on a circle to another going through the center


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