# point An exact location in plane or in space

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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
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
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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