GEOMETRYPRE-UNIT 4

VOCABULARY REVIEW

ALL ABOUT ANGLES

ANGLE DEFINITION

AngleA figure formed by two rays with a common endpoint

Name the type of angle:

Acute AngleAn angle whose measure is between 0° and 90°.

Name the type of angles:

Adjacent anglesTwo angles in the same plane with a common vertex and common side, but no common interior points.

Name the type of angles:

Alternate Exterior AnglesTwo angles that lie outside the two lines on

opposite sides of the transversal.

Name the type of angles:

Alternate Interior AnglesTwo angles that lie between the two lines on

opposite sides of the transversal.

Name the type of angles:

Complementary AnglesTwo angles whose measures have a sum of 90°.

Name the type of angles:

Congruent AnglesAngles that have the same measure.

Name the type of angles:

Consecutive Interior AnglesTwo angles that lie between the lines on the same

side of the transversal.

Name the type of angle:

Corresponding AnglesTwo angles that lie on the same side of the transversal & on the same side of the lines.

Name the type of angles:

Exterior AnglesAny of the four angles made by a transversal that are outside the region between the two intersected lines

Name the type of angles:

Interior AnglesAny 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 AnglesA pair of adjacent angles whose non-common sides

are opposite rays.

Name the type of angle:

Obtuse AngleAn angle that measures greater than 90 degrees and less

than 180°.

Name this figure:

Parallel LinesCoplanar lines that do not intersect and are

equidistant at each point.

Name this figure:

Perpendicular LinesA line is perpendicular to another if it meets or

crosses it at right angles (90°).

Name the type of angle:

Right AngleAn angle that measures 90°.

Name the type of angles:

Same-side Exterior AnglesTwo angles that lie on the same side of the

transversal on the outside of the lines.

Name the type of angles:

Same-side Interior AnglesTwo angles that lie on the same side of the

transversal on the inside of the lines.

Name the type of angles:

Supplementary AnglesTwo angles whose measures have a sum of 180°.

Name the type of figure:

TransversalA line that cuts across two or more

(usually parallel) lines.

Name the type of angles:

Vertical AnglesThe 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.