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1.4 Measuring Angles Date: Goals: • Name and classify angles Angle: • Find the measure of an angle How to name: Diagram: Example 1: Naming Angles For each of the following give two names for 1 , then name the sides and vertex. A. B. C. A S A 2 B 1 1 Q D 1 B C R C Name: Name: Name: Vertex: Vertex: Vertex: Sides: Sides: Sides: Angle measure: How to read a protractor: Angle classifications: Acute Angle Right Angle Obtuse Angle Straight Angle Example 2: Classifying an Angle Classify each angle below based on its measure. A. L B. A N C. W F N B C B A Congruent Angles: Example 3: Using Congruent Angles Use the diagram to the right to answer the following questions. A. PMJ ________ B. If mQHG 115 , then what other angle has the same measure? C. Name two angles that are marked as congruent. D. Name two angles you think may be congruent. Explain. Angle Addition: A D 68 B 41 C Example 4: Using Angle Addition Find the measure of the specified angle in the diagrams below. A. Find mACD B. Find mLNK C. Find mJKG if mJKH 90 L A J B M G 47 56 C 12 x 15 D N 4x K K H