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Chapter One Vocabulary

Across
An angle that is 90 degrees.
Two adjecent angles whose non common sides are opposite rays.
Consists of two different rays with the same endpoint. The rays are the side of the angle, and the endpoint is the vertex of the angle.
Two angles whose sides form two pairs of opposite rays.
Two angles whose measures have the sum of 180 degrees. The sum of the measures of an angle and its supplement is 180 degrees.
Angles that have the same measure.
A closed plane figure with the following properties. It is formed by three of more line segments called sides. Each side intersects exactly two sides, one at each endpoint, so that no two sides with a common endpoint are collinear.
A point that divides, or bisects, a segments into two congruent segments.
A ray that divides an angle into two angles that are congruent.
A rule that is accepted without proof.
Down
An angle that is less than 90 degrees.
An angle that is 180 degrees.
Two angles whose measures have the sum of 90 degrees. The sum of the measures of an angle and its complement is 90 degrees.
Line segments that have the same length.
An angle than is between 90 and 180 degrees.
Two angles that share a common vertex ans side, but have no common interior points.
A polygon such that no line containing a side of a polygon contains a point in the interior of the polygon. A polygon that is not convex and non convex or concave.
Two angles whose measures have the sum of 90 degrees. The sum of the measures of an angle and its complement is 90 degrees.
A concave polygon is a polygon that is not convex. A simple polygon is concave iff at least one of its internal angles is greater than . An example of a non-simple (self-intersecting) polygon is a star polygon. A concave polygon must have at least four sides.
A polygon with n sides.