21 terms

Adjacent angles

Angles that lie in the same plane and share a vertex and a common side. They have no common interior points.

Alternate exterior angles

Angles that are on opposite sides of the transversal and lie on the exterior of the two lines that the transversal intersects.

Alternate interior angles

Angles that are on opposite sides of the transversal and lie with in the interior of the two lines that the transversal intersects

Complementary angles

Two angles whose sum is 90 degrees

Corresponding angles

Angles in the same relative position with respect to the transversal and the intersecting lines

Equidistant

The same distance from a reference point

Exterior angles

Angles that lie outside a pair of parallel lines

Interior angles

Angles that lie between a pair of parallel lines

Linear pair

A pair of adjacent angles whose non-shared sides form a straight angle

Nonadjacent angles

Angles that have no common vertex or common side or have shared interior points

Perpendicular bisector

A line that intersects a segment at its midpoint at a right angle

Perpendicular lines

Two lines intersect at a right angle. The lines form four adjacent and congruent right angles

Plane

A flat two dimensional figure without depth that has at least three noncollinear points and extends infinitely in all directions

Postulate

A true statement that does not require a proof

Proof

A set of justified statements organized to form a convincing argument that a given statement is true

Right angle

An angles measuring 90 degrees

Same-side interior angles

Angles that lie on the same side of the transversal and are in between the lines that the transversal intersects; sometimes called consecutive interior angles

Straight angle

An angle with rays in opposite directions; i. e., A straight line

Supplementary angles

Two angles whose sum is 180 degrees

Transversal

A line that intersects a system of two or more lines

Vertical angles

Nonadjacent angles formed by two pairs of opposite rays