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# Straight lines with an Angle of 45º with the Aid of a Pair of Set Squares

Straight with an angle of 45º with the aid of a pair of triangle or set square

## How to draw straight lines with 45° angle with the aid of a pair of triangle or set square

The squares are used as drawing instruments for tracing and solving geometry problems. It is possible to draw several geometric entities with the aid of a pair of squares, this animation is part of the educational program The Geometric Drawing in Multimedia.

The pair of tringles or set sqaures consists of a square with a right angle and two angles of  45º and the other with a roght angle, one of 30º and another of 60º. In it the hypotenuse of the triangle with 45º angles is congruent to the longest side of the triangle with angles of 30º and 60º. It is recommended to wear brackets without chamfer or graduation.

## Technical drawing Draw lines with 45° angle with the aid of a pair of triangle or set square

Procedimento:

1. Use the 30º square to draw the first line;
2. Without moving it, touch the other square on one of its sides;
3. Slide the 30º square using the second as reference;
4. Replace the second positioning bracket by supporting the side of the 45º angle;
5. Position the square and draw the line from 45º to the first.

##### Eduardo Stefanelli

Engenheiro por profissão, professor por vocação