# Angles

### Lines, Angles & Circles

#### Study Guide Angles

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ANGLES Types of Angles: A right angle is an angle that measures 90°. A straight angle is an angle that measures 180°. An obtuse angle is an angle that measures MORE than 90°. An acute angle is an angle that measures LESS than 90°. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
MEASURING angles using a protractor: 1. Look at the straight edge of protractor: locate the hole that is in the CENTER of that edge. 2. Locate the point (vertex) of the angle you are measuring. Line up that point (vertex) inside the hole of the protractor. 3. Next, line up the 0 on the straight edge of your protractor with one of the sides on the angle. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
4. Then, find the point where the second side of the angle crosses over the curved part of protractor. 5. Finally, look at the number located where the angle line crosses over the curved part of the protractor this is the measure of the angle. The measurement is in degrees (°). Let’s measure this obtuse angle: This obtuse angle measures 160°. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
DRAWING angles using a protractor: 1. Place the protractor on a piece of paper. Using the straight edge of the protractor, draw a straight line, this will be one side of your angle. 2. Find the hole in the center of the straight edge of the protractor. Find the end point (vertex) of the straight line you just drew and line it up in the middle of that hole. 3. Line up the 0 on the straight edge of the protractor with the line you drew. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
4. Find the desired measurement (degree) you would like your angle to be on the curved edge of the protractor and make a MARK above that measurement. Example: if you want your angle to measure 60°, place a mark above the 60° on the curved edge of the protractor. 5. Finally, use the straight edge of the protractor to connect the end point (vertex) of your line to the mark you made. You have now drawn an angle using a protractor. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.