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# Geometry Glossary - C a|b|c|d|e|g|h|i|k|l|m|o|p|q|r|s|t|v|x|y|

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# center of a regular polygon:

The common center of its inscribed and circumscribed circles.

# central angle:

An angle whose vertex is the center of the circle.

# chord:

A segment within a circle with endpoints on the circle.

# circle:

The set of all points in a plane that are a given distance from a fixed point in that plane.

# circumcenter:

The intersection of perpendicular bisectors of sides of a triangle.

# circumscribed circle:

A circle in which a polygon is inscribed.

# circumscribed polygon:

A polygon whose sides are tangent to a circle.

# collinear:

Points contained within the same line.

# complementary angles:

Two angles whose sum of their measures is 90.

# concentric circles:

Coplanar circles of different radii with a common center.

# concurrent lines:

Lines that converge, or intersect, in one common point.

# conditional:

A statement that can be written in the form "If P, then Q."

# cone:

A pyramid-like object whose base is a circle and whose lateral surface is made up of an infinite number of segments between the circle and a vertex.

# congruent angles:

Angles that have the same measure.

# congruent arcs:

Arcs that have the same degree measure.

# congruent segments:

Segments that have the same length.

# congruent triangles:

Triangle with congruent, corresponding sides and angles.

# conjunction:

If p and q are both statements, the statement "p and q" is their conjunction.

# converse:

The statement formed by interchanging the hypothesis and conclusion of a conditional.

# convex:

A polygon is convex if a segment joining any two interior points of the polygon is in the interior of the polygon.

# coordinates:

A corresponding ordered pair (x,y) for every point in a plane.

# coplanar:

Points within the same plane.

# corollary:

A theorem whose proof follows from another theorem in a few steps.

# corresponding angles:

Angles which lie on the same side of a transversal.

# cylinder:

A cylinder consists of two congruent and parallel circular bases whose lateral surface is the infinite number of segments connecting the circles.

Note: The terms in this collection may not be entirely accurate.
They are for reference only.