Angle Relationships Vocabulary

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Linear pair

A pair of adjacent angles whose sum equals 180 degrees.

Vertical angles

A pair of opposite congruent angles formed by intersecting lines

Exterior angle

In a triangle, the angle formed by one side of a triangle and the extension of another side.

Same side interior angles

The two angles that are inside (interior) the parallel lines and are on the same side of the transversal Are SUPPLEMENTARY (add up to 180 degrees).

Same side exterior angles

The two angles that are outside (exterior) the parallel lines and are on the same side of the transversal Are SUPPLEMENTARY (add up to 180 degrees).

Similar triangles

Triangles that have the same angle measures but different side lengths. Solve by setting up a proportion.

Supplementary angles

Two angles whose sum is 180 degrees

Complementary angles

Two angles whose sum is 90 degrees

Transversal

a line that intersects two or more lines

alternate interior angles

angles that lay inside the parallel lines and are on opposite sides of the transversal. They are congruent.

Parallel lines

lines in the same plane that never intersect

Remote interior angles

the two nonadjacent interior angles corresponding to each exterior angle of a triangle

Congruent angles

two angles that have the same measure

Corresponding angles

Angles in the relative location (same place) on different lines.

Alternate exterior Angles

Angles that lay outside the parallel lines and are on opposite sides of the transversal; They are congruent.


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