Angles on parallel lines


Angles on parallel lines.

C.I.A. - This is not the Central Intelligence Agency! This acronym will help you to understand angles on parallel lines. C - corresponding angles I - Interior angles (or supplementary angles) A - Alternate angles Take a look at the graphic below. Corresonding angles are marked in green. Interior angles are marked in red. Alternate angles are marked in blue. Corresponding angles are always equal (on a parallel line). Alternate angles are always equal (on a parallel line) Interior angles (on a parallel line) always add up to 180

CIA - Angles (Corresponding, Interior, Alternate)