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Unformatted text preview: Protractor Postulate Given and a number r between 0 and 180, there is exactly one ray with endpoint A, extending on either side of , such that the measure of the angle formed is r . AB AB Right angle = 90 Acute angle < 90 Obtuse angle > 90 Straight angle = 180 Angle Addition Postulate • If R is in the interior of , then • Converse is also true. PQS ∠ . PQS m RQS m PQR m ∠ = ∠ + ∠ P S Q R • congruent angles – angles that have equal measures. • adjacent angles – 2 angles in a plane that have a common vertex and a common side but no common interior points 30 30 1 2 adjacent are 2 & 1 ∠ ∠ 1 The bisector of an angle is a ray that divides the angle into 2 congruent adjacent angles. 2 2 1 ∠ 2245 ∠ Angle bisector...
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 Fall '10
 Towns
 Geometry, Real Numbers, Angles

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