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GEOMETRY
PRE-UNIT 4
VOCABULARY REVIEW
ALL ABOUT ANGLES
ANGLE DEFINITION
Angle
A figure formed by two rays with a common endpoint
Name the type of angle:
Acute Angle
An angle whose measure is between 0° and 90°.
Name the type of angles:
Adjacent angles
Two angles in the same plane with a common vertex
and common side, but no common interior points.
Name the type of angles:
Alternate Exterior Angles
Two angles that lie outside the two lines on
opposite sides of the transversal.
Name the type of angles:
Alternate Interior Angles
Two angles that lie between the two lines on
opposite sides of the transversal.
Name the type of angles:
Complementary Angles
Two angles whose measures have a sum of 90°.
Name the type of angles:
Congruent Angles
Angles that have the same measure.
Name the type of angles:
Consecutive Interior Angles
Two angles that lie between the lines on the same
side of the transversal.
Name the type of angle:
Corresponding Angles
Two angles that lie on the same side of the
transversal & on the same side of the lines.
Name the type of angles:
Exterior Angles
Any of the four angles made by a transversal that are
outside the region between the two intersected lines
Name the type of angles:
Interior Angles
Any of the four angles made by a transversal that lie
inside the region between the two intersected lines
Name the type of angles:
Linear Pair of Angles
A pair of adjacent angles whose non-common sides
are opposite rays.
Name the type of angle:
Obtuse Angle
An angle that measures greater than 90 degrees and less
than 180°.
Name this figure:
Parallel Lines
Coplanar lines that do not intersect and are
equidistant at each point.
Name this figure:
Perpendicular Lines
A line is perpendicular to another if it meets or
crosses it at right angles (90°).
Name the type of angle:
Right Angle
An angle that measures 90°.
Name the type of angles:
Same-side Exterior Angles
Two angles that lie on the same side of the
transversal on the outside of the lines.
Name the type of angles:
Same-side Interior Angles
Two angles that lie on the same side of the
transversal on the inside of the lines.
Name the type of angles:
Supplementary Angles
Two angles whose measures have a sum of 180°.
Name the type of figure:
Transversal
A line that cuts across two or more
(usually parallel) lines.
Name the type of angles:
Vertical Angles
The non-adjacent angles formed by
two intersecting lines.
UNIT 4
PARALLEL LINES & TRANSVERSALS
THEOREMS & POSTULATES
ALL THE RULES
Alternate Exterior Angle Theorem
If two parallel lines are cut by a transversal, then
the alternate exterior angles are congruent.
Alternate Interior Angle Theorem
If two parallel lines are cut by a transversal, then
the alternate interior angles are congruent.
Corresponding Angle Postulate
If two parallel lines are cut by a transversal, then
the corresponding angles are congruent.
Consecutive Interior Angle Theorem
If two parallel lines are cut by a transversal, then
the consecutive interior angles are supplementary.
Same Side Exterior Angle Theorem
If two parallel lines are cut by a transversal, then
the same side exterior angles are supplementary.