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Geometry Midterm Vocabulary

Across
A portion of a line with two endpoints.
Congruent angles that are across from each other when lines intersect.
An angle between zero and 90 degrees.
Term used for points on the same line.
Angles that add to 180 degrees.
Congruent angles who share the same "position" when parallel lines are cut by a transversal.
Angles inside a pair of parallel lines and on different sides of a transversal.
Has one endpoint and extends forever in one direction.
The common endpoint where the two sides of an angle meet.
A line that intersects two or more lines.
Term used to describe when two things are identical.
These are used to mark segments and sides as congruent.
A term used to describe a 90 degree angle.
Term used for things on the same plane.
Flat surface that extends forever.
To cut something into two congruent parts.
Down
A triangle where all three sides are congruent.
These are used to mark angles as congruent.
Term for a triangle with three different side lengths.
Formed when two rays, lines, or segments meet at a common endpoint called a vertex.
An angle larger than 90 degrees, but less than 180.
Extends forever in opposite directions and is named using two points.
When two rays, lines, or segments form a 90 degree angle.
Angles inside a pair of parallel lines and on the same side of a transversal.
Angles that add to 90 degrees.
These are used to mark lines as parallel.
A triangle with two congruent sides.
Supplementary angles lying next to each other on a straight line.