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					                     CLASS NOTES: How to Measure Angles
What you’ll need: a Protractor, a Pencil, and
your knowledge of how to classify/name an                                                       H
angle.                                                                      
                                                                            F          G
Instructions: Measure  FGH


                                                                                     120 o

                                                                                     60 o




                                                            H
                                        
                                        F

            Hole & Vertex



Steps               What to do                                              HINTS
Step          Put your pencil through
              the hole of the
                                            Using your pencil, make the rays longer so they extend beyond your
                                            protractor.
1             protractor.

Step          Put your pencil on the
              vertex.
                                            Make sure the numbers on your protractor are facing you correctly.
                                            The vertex of this angle is Point  G
2
Step          Line-up the protractor.       This may mean your protractor is crooked like it is above.

3
Step          Record both values
              where the 2nd ray
                                            Count by 10s until you reach the second ray.

4             crosses the protractor.

Step          DOUBLE CHECK YOUR
              WORK… Ask yourself,
                                            If the answer is YES, your measurements are correct!!! (120 + 60=180)
                                            
5            “Do both numbers add
              up to 180o?”
Step          Name the angle. That’s
              the number you
                                            Is the angle: 1-right, 2-acute, 3-obtuse, 4-straight angle or 5-zero
                                            degree angle/ray?
6             choose.                       This angle is obtuse, and the definition of an obtuse angle. is “An
                                            angle whose measure is greater than 90 and less than 180”. Which
                                            number is between 90 and 180? 120 is, so this angle is 120o. Circle
                                            120o.


                                                    120 o

                                                    60 o
                                                                                                                     Page 1
                                                            C:\Docstoc\Working\pdf\4d6a5eeb-26b6-40a3-b9c1-c7c9cc366233.doc
                                                         H

				
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