A protractor is used to draw and measure angles. An angle is the amount of turn between two lines. Angles are measured in degrees with the symbol °. Angles can be labelled with 3 letters (eg DEF ...

When it comes to measuring the angles, things need to be a little more exact than holding up a plastic protractor; that’s where a theodolite comes in, a telescope-looking type of optical ...

But you don’t have to break out the protractor; you can easily use a level to determine the angle of the cut.

In order to see how well a corn plant is performing photosynthesis, you need to check the angle of its leaves relative to its stem. And while scientists ordinarily have to do so with a protractor ...