The intersection of two lines is a point. If both lines are straight the figure of four separate triangles are formed. The type of triangles are dependent on the angle of the intersection.
That would be an "angle".
Perpendicular lines or parallel lines are two examples
If you mean an angle then an angle is formed by two straight lines meeting at a vertex.
Angle
angle
angel
The answer is {Angle}
Angle. Also, two lines which intersect at a point can define a plane.
It is a polygon that has 3 or more sides.
Minimum and maximum requirements: three straight lines meeting pairwise. Minimum and maximum requirements: three straight lines meeting pairwise. Minimum and maximum requirements: three straight lines meeting pairwise. Minimum and maximum requirements: three straight lines meeting pairwise.
If they are straight lines then it is a polygon.
A number of straight lines, all in one plane, meeting at vertices so as to enclose a single area.