This is the step-by-step, printable version. If you PRINT this page, any ads will not be printed.
See also the animated version.
|Begin with two lines that intersect at Q. We plan to measure angles JQM and LQK and verify the angles are the same.|
|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.|