# 8-3 - What is the measure of <2? <2 is 120º because...

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Special Pairs of Angles Lesson 8-3

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Complementary Angles If the sum of the measures of two angles is  exactly 90º then the angles are  complementary.
Supplementary Angles If the sum of the measures of two angles is  exactly 180º then the angles are  supplementary.

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Vertical Angles Vertical angles are formed by two  intersecting lines.  They are the angles that  are opposite each other.  Vertical angles  are  congruent  (they have equal  measures). In this picture, <1 and <3 are vertical angles.

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Unformatted text preview: What is the measure of <2? <2 is 120º because it is congruent to the vertical angle across from it. Transversals A transversal crosses two or more lines at different points: • Interior angles are on either side of a transversal between a pair of lines. • Exterior angles are on either side of a transversal outside of a pair of lines. Angles 3,4,5, and 6 are interior angles. Angles 1,2,7, and 8 are exterior angles. Homework Time!...
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## This note was uploaded on 11/17/2011 for the course MATH 110 taught by Professor Staff during the Fall '08 term at BYU.

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8-3 - What is the measure of <2? <2 is 120º because...

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