If you want to just measure the angle and use the tan.

You can measure the angle between the two lines with your protractor.

To measure the angle between the two lines we use a protractor.

The essential function of the device was to measure angles.

He could have used a compass to measure the angle of the shadow cast.

Now measure the angle between North and each of the following places:

In his work Euclid never makes use of numbers to measure length, angle, or area.

Now, have someone measure the angle each lower leg makes with the vertical (see illustration).

People usually use a protractor to measure and draw angles.

This fact is known by measuring the angle of the electron's motion after passing through.