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Angles formed by Parallel Lines and
Transversals
Transversal
Parallel Lines
http://www.mathsisfun.com/geometry/alternate-interior-angles.html
Parallel Lines – two lines in the same plane
that never intersect.
Transversal
Parallel Lines
http://www.mathsisfun.com/geometry/alternate-interior-angles.html
Transversal – A line which intersects
(crosses) two or more parallel lines.
Transversal
Parallel Lines
http://www.mathsisfun.com/geometry/alternate-interior-angles.html
Alternate Interior Angles
Alternate Interior Angles – angles that fall on
opposite sides of the transversal in the interior of two
parallel lines. Alternate Interior angles are congruent.
Alternate Interior
Angles
Alternate Exterior Angles
Alternate Exterior Angles – angles that fall on
opposite sides of the transversal in the exterior of two
parallel lines. Alternate Exterior angles are congruent.
Alternate Exterior
Angles
Vertical Angles
Vertical Angles- angles opposite one another at the
intersection of two lines. Vertical angles are congruent.
Angles 1 and 4 are
vertical.
Angles 2 and 3 are
vertcial.
m 1 = m 4
m 2 = m 3
Corresponding Angles
Corresponding Angles – angles that fall in the same
position when two parallel lines are cut by a transversal
(same side of the transversal, one on the interior and one on
the exterior of the two parallel lines). Corresponding
Angles are congruent.
Corresponding
Angles
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