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We learn by doing. If we do nothing, we learn nothing. The more we do, the more we learn. 1:6 Exploring Angles OBJECTIVES: Use the Angle Addition Postulate to find the measures of angles Use congruent angles and the bisector of an angle RELEVANCE: Ray Extends indefinitely in one direction. EXAMPLES: . R . H . D . M Ray MR (MR) Ray DH ( DH) The endpoint must be the first letter in the name Opposite Rays Form a line Referred to as a straight angle . B . C . M CB and CM are opposite rays Angle Formed by two rays with a common endpoint. The two rays are called the sides The common endpoint is the vertex EXAMPLE: A <ABC B 1 <B C <1 . . . Types of Angles Acute Angles – measure less than 90º Right Angles – measure 90º Obtuse Angles – measure more than 90º Don’t forget the STRAIGHT ANGLE! Angle Bisector A ray that divides an angle into two congruent angles Angle Addition Postulate If R is in the interior of PQS, then mPQR + mRQS = mPQS.