Set squares are drawing instruments used to create vertical, horizontal, and diagonal lines as well as certain angles. They may be shaped as squares, Ls, or triangles, although in American usage set ...

Horizontal and vertical lines Learn how to identify ... a formula to find out the internal angles within a polygon. Angles in triangles Learn how to calculate angles in triangles.

You'll like draw a perfect square or rectangle by drawing congruent angles to form the box, and then congruent triangles (equilateral triangles) form the pitched roof. An easy way to remember ...