The sum of interior angles in a quadrilateral is 360°. This fact is a more specific example of the equation for calculating the sum of the interior angles of a polygon: \(\text {Sum of interior angles ...

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 ...

Setting posts is tricky—you typically need a solid base and a top that is completely level, which is difficult when the base of a post is sitting on an angle. Here's a great tip for obtaining the ...