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.
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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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