Set squares are templates in the form of a right-angled triangle. With the help of a ruler, they allow you to draw horizontal lines, vertical lines and lines at an angle to the horizon. There are two types of set squares: • The 45º set square has two angles of 45º and one right angle of 90º. This shape forms an isosceles triangle because two of its sides and two of its angles have the same measurements. • The 60º/30º set square has two acute angles of 60º and 30º, and one right angle of 90º. This shape forms a scalene triangle because all of its sides and angles have different measurements. Set squares are used to form angles of different sizes. To do this, you place the T-square horizontally and put the set squares in the positions you can see on the right. 1 Us i ng s e t s qua r e s 0° HORIZONTAL 0° HORIZONTAL 15° 15° 30° 45° 60° 75° 30° 45° 60° 75° 15° 15° 30° 45° 60° 75° 30° 45° 60° 75° 90° VERTICAL 90° VERTICAL GALLERY Set squares can be made from various materials, but they are usually made of clear plastic. 90º 60º 30º 60º/30º set square 90º 45º 45º 45º set square Technical Drawing I 5
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