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Warm Up • If RS = 3x + 1, and ST = 15x – 9, RT = 64, find the value of x. Then find RS, and ST. 1.4 Measure and Classify Angles • An angle consists of two different rays with the same different rays endpoint. • The rays are the sides side of the angle. The endpoint s is the vertex of the angle. vertex • The angle with sides (ray) AB and (ray) AC can be named <BAC , <CAB, or <A. Example: Name Angles Name three angles is the diagram: Example: Name Angles Name three angles in the diagram: Congruent Angles: Two angles are congruent angles if they have the exact same angle anglemeasure. measure Measuring Angles A protractor is used to find the measure of an angle. “The measure of angle BAC is 50 degrees.” Classifying Angles: Copy these into your foldable classification example measure range Angle Bisector • Write this in your foldable • A ray that divides an angle into 2 congruent adjacent angles. A D B C BD is an angle bisector of <ABC. Angle Addition Postulate this of into Postulate: write The sum theyour two foldable smaller angles will always equal the measure of the larger angle. Complete: M MRK+ m KRW m ____ ____ = m MRW _____ K W R • Example: Given the <LKN = 145 degrees, find m<LKM and m<MKN