Set-square:

 Set-square is of triangular shape and is generally created of clear plastic. There are two kinds of set-square. They are as:

(a)  A 30^o - 60^o - 90^o triangle

(b)  A 45^o - 45^o - 90^o triangle

All straight lines and vertical lines in particular, except horizontal lines, can be drawn along with the assist of a set-square. During combination along with a T-square, lines inclined at 30^o, 60^o and 45^o can be drawn. By using two set-squares along with a T-square, lines inclined at 15^o, 75^o and 105^o can be drawn also. Parallel lines not far apart can be drawn through using of two set-squares.

Figure: Set-Square