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How to Classify Angles
Transcript of How to Classify Angles
1. acute(less then 90 *d)
2. obtuse( more then 90 d)
3. right( 90 d)
4. reflex ( more then 180 d)
5. straight( 180 d )
*d=degrees 1. acute angles: acute angles are angles that are smaller then 90 degrees , they seem to be closed up the most compared to other angles. One of the easiest ways to identify this angle is to compare it to a right angle. It is also resembling a crocadile jaw? Then its probabley an acute angle. To check use a protracter.If it is less then 90 degrees you've got yourself an acute angle. eg.This is an example of a acute angle. Notice it's shape. eg. This is what an acute angle looks like. Notice how it bends in. 2.Obtuse angles: obtuse angles are larger then 90 d and seem to be spreading open. An obtuse angle cannot be larger then 179 degrees and smaller then 90 degrees, but can't be 90 degrees. Protractors Now, if you want to measure an angle you have to know that you need a protracter! Throughout history the ancient Egyptians and Babylonians have been measuring angles but they were never as acurate as we are today. All because of this mathmatical instrument! In this chapter we will learn how to measure an angle with a 180 degree protracter. This angle is about 45 degrees making it an acute angle. LETS GET STARTED! 3. Right Angles: a right angle is an angle that is exactly 90 degrees. It resembles the letter L. You see right angles a lot in your everyday life such as door
frames, computer screens, and cardboard boxes.Check by using a protractor. 4. Reflex angles: reflex angles are angles that are in between 180 degrees an 360 degrees. To measure a reflex angle with a protractor you must find the normal angle first then you subtract your number from 360 wich should be your answer. Use opposite opperations to check. 5. Straight Angle: a straight angle is an angle that is exactly 180 degrees. It resembles a straight line and can often be found in everyday life. Some examples are: rulers, a tabletop, paper etc. Check by using a protractor. 1. Line up your protractor so that the zero on the protractor to where it lines up with the vertex of the angle. Make sure you line up one arm of the angle with the base line of the protractor. 2.Find where the arm of the angle meets with the protracteor. 3. Start at 0 degrees on the arm along the base line. 4.The top arm should read what the angle is. Remember to double check! Angles in the World Angles are all around us almost every thing has at least one angle. Here are some pictures showing angles in evereyday life! This hand motion is a right angle. This screwdriver is a right angle as well. This wooden tabletop has many straight angles on it. This spider has spun what appears to be an obtuse angle web! Angles are not only in your textbook! Can you spot the angle in this picture? The Verdict Angles appear all of the time! There are many diffrent kinds , many ways to measure them , and they can be found on tabletobs to a cartoon character! With angles.....math makes sense! CREDITS Tara Cousins
CoolPix co. Thank You! see the acute angle? This is what a 180 degree protractor looks like , notice how the protractor is half of a circle. Some of my own photos: Can you spot the angle in this picture?