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.