Unit 1 Flashcards

Front

Supplementary

Back

Angles that add to 180 degrees.

Front

Complementary

Back

Angles that add to 90 degrees.

Front

Linear Pair

Back

Two angles that are adjacent and formed by intersecting lines. A linear pair creates a line and the angles are supplementary (180 degrees).

Front

Perpendicular Lines

Back

Symbol: ⊥ Form 90 degree angles (right angles).

Front

Vertical Angles

Back

A pair of non-adjacent angles formed by the intersection of two straight lines. Vertical angles are always equal (congruent).

Front

Angle Bisector

Back

A line that divides an angle into two angles that are congruent (equal).

Front

Congruent

Back

Having the same measure. Equal. Symbol: ≅

Front

Corresponding Angles

Back

Same side of the transversal, same side parallel lines. Always congruent

Front

Alternate Interior Angles

Back

Opposite side of transversal, inside parallel lines. Always congruent

Front

Alternate Exterior Angles

Back

Opposite side of transversal, outside parallel lines. Always congruent