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) to ...
A theoretical astrophysicist uses his protractor to measure the universe. From a sheet of paper to the cosmos. Lots of pictures! This post is from Observer Short List—an email of three favorite things ...
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