a pencil
That's commonly known as a "straight edge".
A ruler is an instrument commonly used to construct straight lines. It typically has a straight edge marked with measurement units, allowing for precise drawing and measurement. Rulers can be made from various materials, including plastic, wood, or metal, and are essential tools in geometry, engineering, and various crafts.
A ruler.
The compass is used to measure angles. The straightedge is used to draw a straight line. The two items together, are used to measure and draw angles and lines in geometric drawings.
a tool used to draw straight lines or measure straight lines miss pawz: a measuring instrument :)
A straight edge or a rule are used to construct straight lines. Laser line setter, In some cases a plumb line
A straight edge or a ruler are used to construct straight lines.
A straight-edge
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 ruler is an instrument commonly used to construct straight lines. It typically has a straight edge marked with measurement units, allowing for precise drawing and measurement. Rulers can be made from various materials, including plastic, wood, or metal, and are essential tools in geometry, engineering, and various crafts.
A ruler.
COMPASS
Compass
Maybe, but a straight edge and a pair of compasses would have probably been used to construct a perpendicular line bisector for a given line segment.