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

The essential function of the device was to measure angles.

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 angle measured is that between the feet when the heels are touching in first position.

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.

People usually use a protractor to measure and draw angles.

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