ⴳ ⵜⵏⵣⴳⴳⵉⵜ ⵜⵓⴳⵏⵉⵡⵜ, ⴰⴽⵓⵥⴷⵉⵙ ⴷ ⴰⴳⴷⴷⵉⵙ ⵉⵍⴰⵏ ⴽⴽⵓⵥ ⵏ ⵉⴷⵉⵙⵏ. ⴳⴰⵏ ⵉⵙⵏⵙⴰⴷⴰⵖⵏ, ⵉⵎⵙⴷⵖⵉⴷⵉⵙⵏ, ⵉⵎⵖⵔⵓⵏⵏ, ⵉⵎⴽⴽⵓⵥⵏ ⴷ ⵜⵢⵍⴰⵍⵉⵏ ⵏ ⵓⴼⵔⴽⵓⴽ ⵉⴽⵓⵥⴷⵉⵙⵏ ⵉⵥⵍⵉⵏ.
![](http://upload.wikimedia.org/wikipedia/commons/6/65/Convex_quadrilateral.png)
ⴳ ⵜⵏⵣⴳⴳⵉⵜ ⵜⵓⴳⵏⵉⵡⵜ, ⴰⴽⵓⵥⴷⵉⵙ ⴷ ⴰⴳⴷⴷⵉⵙ ⵉⵍⴰⵏ ⴽⴽⵓⵥ ⵏ ⵉⴷⵉⵙⵏ. ⴳⴰⵏ ⵉⵙⵏⵙⴰⴷⴰⵖⵏ, ⵉⵎⵙⴷⵖⵉⴷⵉⵙⵏ, ⵉⵎⵖⵔⵓⵏⵏ, ⵉⵎⴽⴽⵓⵥⵏ ⴷ ⵜⵢⵍⴰⵍⵉⵏ ⵏ ⵓⴼⵔⴽⵓⴽ ⵉⴽⵓⵥⴷⵉⵙⵏ ⵉⵥⵍⵉⵏ.