Parallel and perpendicular lines Discover the difference ... how to draw and measure angles up to 180 degrees using a protractor. Angles in polygons Learn how to use a formula to find out the ...

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 ...

Don’t you love it when the title track is the first one on the album? I had to single out this adjustable keyboard called the Protractor, because look at it! The whole thing moves, you know.