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## A N G L E S

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**What is an angle?**• Two rays that share the same endpoint form an angle. • The point where the rays intersect is called the vertex of the angle. Vertex Ray Angle**Here are some examples**of angles.**Angle Measurements**• We measure the size of an angle using degrees. The symbol for degrees is o • Here are some examples of angles and their degree measurements.**Acute Angles**• An acute angle is an angle measuring between 0 and 90 degrees. • The following angles are all acute angles.**Obtuse Angles**• An obtuse angle is an angle measuring between 90 and 180 degrees. • The following angles are all obtuse.**Right Angles**• A right angle is an angle measuring exactly 90 degrees. • The following angles are both right angles.**Straight Angle**• A straight angle is exactly 180 degrees.**Measuring Angles**• You can measure angles using a protractor.**Naming Angles**< DEF OR < FED The vertex always goes in the middle D • There are 3 ways to name angles: • Using 3 letters • Using 1 letter • Using a number E F <K K <6 6**<K OR <JKL OR <LKJ**<J OR <MJK OR <KJM J K M L <M OR <LMJ OR <JML <L OR <MLK OR <KLM**Complementary Angles**Two Angles are Complementary if they add up to 90 degrees (a Right Angle).**Supplementary Angles**Two Angles are Supplementary if they add up to 180 degrees (straight angle).**Practice questions out of the textbook:**pg. 4181-4, 8-11 OL Pg. 4221-3 (estimate the measure) , 8-14, 20-23, 27-35 PAP Pg. 422 11-33 PAP Pg. 42713-17, 22-24