They are what makes it a rectangle. The rectangle is a special kind of parallelogram. The perpendicular lines cause it to be called a rectangle.
A kind of line which is not required to be straight. Curved lines are often called irregular lines.
intersecting lines divergent lines convergent lines
inactive
lines that are beside each other and never meet
Parallel lines
Straight lines.
Straight ones... Not truly lines, but segments
They are undefined lines.
Perpendicular and parallel lines are two examples.
Mutually perpendicular lines.
Parallel lines-lines in the same plane with the same slope.