ruler
You cannot. You cannot ensure the lines are strictly parallel using only a ruler.
a ruler
use a protractor and a ruler
Measuring implies using a measuring device of some kind. If you mean to construct a hexagon without a protractor or ruler, that's different. Constructions in geometry require only a compass and a straightedge (a ruler, but you ignore the numbers). A hexagon can be made of 6 equilateral triangles; choose any length for the side and construct them connected together, using only the compass to set the length and the straightedge to draw straight lines between points.
ruler
In construction, all you need is a compass and a ruler.
You cannot. You cannot ensure the lines are strictly parallel using only a ruler.
A T-square
A straight edge or a ruler are used to construct straight lines.
An Ancient Ruler.
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.
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
Parallel lines remain the same distance apart, always. Use a ruler to measure the distance at different intervals.Extend the lines out to see if they intersect.Check the line to see if there is the 'parallel' symbol.
a ruler
by using a ruler and a compass
use a protractor and a ruler