Angle Relationships

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vertical angles

A pair of opposite congruent angles formed by intersecting lines.

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)

complementary angles

Two angles whose sum is 90 degrees

alternate exterior angles

angles that lie outside a pair of parallel lines and on opposite sides of a traversal that are congruent

same side exterior angles

exterior angles that lie on the same side of the transversal. Are SUPPLEMENTARY (add up to 180 degrees)

adjacent angles

side by side angles that share a common vertex and a ray

triangles

Has 3 sides and 3 angles; all three angles add up to 180 degrees

supplementary angles

Angles that add to 180 degrees (can be adjacent or non-adjacent)

congruent angles

Angles that have the same size and shape.

corresponding angles

Angles that lie on the same side of the transversal and in corresponding positions.

alternate interior angles

Angles that lie within a pair of parallel lines and on opposite side of a traversal that are congruent.

transversal

A line that crosses two or more lines

pentagon

a five-sided polygon where the interior angles add up to 540 degrees

quadrilateral

a four sided shape, all angles add up to 360 degrees

Linear Angles (Linear Pair)

adjacent angles whose non common sides are opposite rays, that when added together equal 180 degrees

parallel lines

two or more lines that never cross or touch


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