You are probably referring to a line, ray, or a line segment.
Each of these figures are straight and are one-dimensional (or 1D).
A line goes forever in both directions, and looks like an arrow pointing in 2 opposite directions.
A ray goes forever in one direction. It has an arrow pointing in one direction, and in the opposite direction there is a dot, or point, that marks the endpoint.
A line segment has two points on either side and does notgo on forever.
A geometrical construction can be made with with a straight edge and a compass.
A ruler can be classed as a straight edge.
A straight edge
Usually a pair of compasses, a protractor and a straight edge such as a ruler.
A construction. A construction is a geometric drawing of a figure usually made by a compass and/or a straightedge
A geometrical construction can be made with with a straight edge and a compass.
Geometric figures can be drawn using a compass and a straight edge. This is commonly known as ruler and compass construction.
A ruler can be classed as a straight edge.
A straight edge
nonagon
a yard of floers
Usually a pair of compasses, a protractor and a straight edge such as a ruler.
A construction. A construction is a geometric drawing of a figure usually made by a compass and/or a straightedge
A straight edge looks like a ruler.
A ruler is a straight edge
the edge
A ruler is a straight edge