|
Using a Protractor to Measure Angles
Click here for a printable angle measurement worksheet
InstructionsClick Next or Run to see a demonstration of how to use a protractor to measure an angle.
(If there is no image below, see support page.)
The animated diagram above shows how to use a protractor to measure angles. It shows how to measure two angles that are
vertical angles and
so should be equal in measure. It verifies that both the angles
∠LQK and ∠JQM are in fact equal.
For a description of the protractor see The Protractor
For a demonstration of using the protractor to draw an angle see Drawing Angles with a Protractor
Step-by-step Instructions
| Step 1 |
Place the protractor so that the origin (small hole) is over the point Q. |
| Step 2 |
Rotate the protractor so that the base line is exactly along the line JK. |
| Step 3 |
Using the inner scale, read the angle over the line LM. It should read 34 degrees.
This shows that the angle ∠LQK has a measure of 34°. |
| Step 4 |
Now, rotate the protractor so that its base line is along the line LM |
| Step 5 |
Using the outer scale, read the angle over the line JK. It should read 34 degrees,
showing that the angle ∠JQM also has a measure of 34°. |
| Step 6 |
Done. By measuring these two angles, you have verified that
vertical angles are
congruent. |
Try it yourself
Click here for a printable angle measurement worksheet.
When you get to the page, use the browser print command to print as many as you wish. The printed output is not copyright.
Related angle topics
General
Angle Types
Angle relationships
(C) 2007 Copyright John Page
|