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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.
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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: • The endpoint must be the first letter in the name . R . . . H M D Ray MR (MR) Ray DH ( DH)
Opposite Rays • Form a line • Referred to as a straight angle • CB and CM are opposite rays . . . B C M
Angle • Formed by two rays with a common endpoint. • The two rays are called the sides • The common endpoint is the vertex • EXAMPLE: <ABC <B <1 . A . . B 1 C
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.