During the lab, you may find it useful (or necessary!) to measure angles on the video.
One way to do this would be to print out the frames you want to measure and use an old-fashioned protractor. This would be expensive, time consuming, and would waste a lot of paper.
The point-to-angle converter will help you to do this directly on the computer using a captured still from the video. You can't measure points on the video, you need a still graphic!
Try this for yourself.
Say you want to measure angle "X" below.
1. Launch the Point To Angle Converter.
2. Move the Point To Angle Converter off to the side.
3. Click on the vertex of the angle. Check that the point
was recorded, if not click again.
4. Click once on either ray that extends from the vertex.
These should both be recorded automatically below.
5. Record the values below in the Point To Angle Converter.
Remeber the vertex is the bottom entry.
6. Click calculate on the PTAC, it should read around
30 degrees.
If you have trouble with the automatic recorder, feel free to write the points on paper!
Note that the converter is designed, for technical reasons,
to always give an angle less than 90 degrees so if you believe your angle
is greater than 90 degrees, you simply need to find the supplementary angle
to the one given (180 - yourangle).
Here is what your finished activity should look like:
