Circles: Circles: VocabularyVocabulary

and and PropertiesProperties

CircleA set of all points in a plane at a given distance from a given point called the center.

WHERE?Interior of the circle?Exterior of the circle?

On the Circle?

RadiusA segment from a point on the circle to the center of the circle.

EXAMPLES

ChordA segment whose endpoints lie on the circle.

DiameterA chord passing through the center of a circle.

SecantA line that contains a chord.

EXAMPLES

Congruent CirclesTwo circles whose radii have the same measure.

EXAMPLES

Concentric CirclesTwo coplanar circles having the same center.

EXAMPLES

TangentA line in the plane of the circle that intersects the circle in exactly one point.

EXAMPLES

A polygon is inscribed in a circle if every vertex of the polygon is a point on a circle.

The triangle, octagon and square are inscribed in the

circle.

... and the circle is circumscribed about the polygon.

Tangent

slim, infinite(adjective)

meets, touches, strokes (verb)

but only at one point(phrase)

PART OF A CIRCLE(definition/description)