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# 1.6 - 2 rays with a common endpoint rays meet at the vertex...

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2 rays with a common endpoint rays meet at the vertex vertex
Name this angle : C 1 A CAT TAC A T 1

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Name these angles: B 2 E BED DEB E D 2
Name the angles: T A P 4 3 N

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ACUTE less than 90° RIGHT 90°
OBTUSE greater than 90° less than 180 ° STRAIGHT 180°

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B A 30 30 AB    have the same measure
1 2 3 4 2 opposite s formed by intersecting lines Vertical angles are congruent 12    34   

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1 and 2 are adjacent share a side share a vertex no common interior points coplanar 1 2 2 1
total 90° 60° 30° total 180° 120° 60° COMPLEMENTARY ANGLES SUPPLEMENTARY ANGLES

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formed by 2 intersecting lines adjacent add up to 180° LINEAR PAIR of Angles 1 2 1 2
Can you name the linear pairs? a b c d

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Protractor Postulate m= degree # - degree # O C D m = 40 110° - 70°   
Angle Addition m 1 m 2 m AOC      A O C

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1.6 - 2 rays with a common endpoint rays meet at the vertex...

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