# Frequently asked questions - Draw

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## How do I draw a regular equilateral triangle?

The Drawing toolbar has a button to draw an isosceles triangle but not an equilateral triangle. To draw one, you must do a little geometry. In fact, an equilateral triangle is an isosceles triangle whose height *h* is:

[math]\displaystyle{ h=\mathit{a.}\sin \left(\frac{\Pi }{3}\right)=\mathit{a.}\sin \left(60\circ \right)=\mathit{a.}\frac{\sqrt{3}}{2}\approx a\times \mathrm{0.866} }[/math] with *a* representing the length of any edge of the triangle.

To draw an equilateral triangle:

- click on the triangle to the right of the Basic Shapes icon to open the Basic Shapes toolbar. In the toolbar, click on the Isosceles Triangle button.

- click and drag to draw a triangle of about the size desired;
- select the ▸ menu;
- make sure
**Keep ratio**is unchecked; - adjust:
- the height so that it equals the width multiplied by 0.866,
- the width so that it equals the height divided by 0.866,or
- both, maintaining the proportion 0.866 between the height and the width;

- If you change the size of the triangle, click
**Keep ratio**to keep the length of the three sides equal. - Click OK.

Another way to create equilateral triangle is to:

- Draw first edge:
- Draw a line, holding
`⇧ Shift`, so it is a straight line. - Click on it, press
`F4`to open properties. - Tab
**Position and Size**, set**Width**to expected length. - Click
**OK**.

- Draw a line, holding

- Draw second edge:
- Copy and paste
`Ctrl`+`C`,`Ctrl`+`V`to create a copy. - Press
`F4`to open properties. - Tab
**Rotation**, select**Pivot Point**on a left position and set**Rotation Angle**to 60".

- Copy and paste
- Draw third edge:
- Create another copy of the base line with
`Ctrl`+`V`. - Press
`F4`to open properties. - Tab
**Rotation**, select**Pivot Point**on a right position and set**Rotation Angle**to 300".

- Create another copy of the base line with
- Combine edges in one shape:
- Select all lines.
- Select menu entry
`⇧ Shift`+`Ctrl`+`K`. ▸ or