protractors, parallel rules, sectors, and scale rules. By the 17th century, European makers of scientific instruments also sold drawing and calculating tools in sets. These were typically made of wood ...
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 ...
protractors, parallel rules, sectors, and scale rules. By the 17th century, European makers of scientific instruments also sold drawing and calculating tools in sets. These were typically made of wood ...
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