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Name:______________________________ Geometry Concepts Chapter 3 Terms Term Naming angles Vertex of an angle Interior of an angle Exterior of an angle Acute angle Obtuse Angle Right Angle Straight angle Angle bisector Adjacent angles Linear pairs Complementary angles Supplementary angles Vertical angles Perpendicular lines Definition Example Name:______________________________ How to find the measure of an ANGLE with a protractor: Steps: 1. Put the vertex in the middle of the line on the bottom of the protractor. 2. Decide whether it is an acute or obtuse angle. 3. Choose the larger number for obtuse angles and the smaller number for acute angles. 4. Name the angle with the vertex in the middle of three letters. 5. Write = the number of degrees with a symbol. How to find a missing angle in a diagram: Steps: 1. If the angle is made up of two or more parts that you know, then add them together. 2. If the angle is part of a bigger angle, then subtract the other smaller angle(s) from the bigger angle. 3. If a line bisects an angle, then the smaller angle is half of the bigger angle. 4. If the angles form a right angle, then make the big angle 90. 5. If the angles form a linear pair or straight angle, then make the big angle 180 6. If the angles are vertical angles, then they are equal to each other.