That's commonly known as a "straight edge".
a pencil
a tool used to draw straight lines or measure straight lines miss pawz: a measuring instrument :)
The most common tool used to draw straight lines is the age old ruler. If you don't have a ruler you can also substitute it with any straight edge found nearby.
ruler
A straight edge or a ruler are used to construct straight lines.
A straight-edge
A straight edge or a rule are used to construct straight lines. Laser line setter, In some cases a plumb line
A straight edge perhaps?
The instrument that is used to construct straight lines is called a rule. Often people make the mistake of calling it a ruler, but its a rule.
That's commonly known as a "straight edge".
An instrument to construct straight lines is called a rule. It's often referred to as a ruler, but a ruler is someone who rules a country. A rule is a piece of wood, metal or plastic (usually showing measurements) that you can use to draw/construct straight lines.A straight edgeThe most common one is a ruler
a pencil
a tool used to draw straight lines or measure straight lines miss pawz: a measuring instrument :)
The most common tool used to draw straight lines is the age old ruler. If you don't have a ruler you can also substitute it with any straight edge found nearby.
COMPASS
Compass