perpendicular.
fault
Parallel lines can have a line crossing both of them. They call that the transversal. Corresponding angles are on the same side of the transversal. Alternate are on opposite sides of the transversal.
Opposite sign? Additive inverse.
parallel lines
Vertically opposite.
perpendicular.
It is a trapezoid that has only one pair of opposite parallel lines of different lengths.
When two lines cross each other they form vertical equal opposite angles
fault
Parallel lines can have a line crossing both of them. They call that the transversal. Corresponding angles are on the same side of the transversal. Alternate are on opposite sides of the transversal.
An incoming call
intersecting lines
The number you are referring to is called the reciprocal of 1. When a number is divided by 1, the result is the same number, so the reciprocal of 1 is also 1. In mathematical terms, the reciprocal of a number x is denoted as 1/x.
If the question means, "What do you call the point where two lines cross?" The answer would be "intersection". Otherwise, I would call them 2 intersecting lines.
when you flip the numerator and denominator you call it the reciprocal. hope it helped.
Opposite sign? Additive inverse.