Lines that intersect at a 90-degree angle.

Lines that curve away from each other.

Parallel lines are lines in a plane that do not meet; they stay the same distance apart and are in the same plane.

Lines that meet at infinity.

A transversal is a line that intersects two or more lines at distinct points.

A transversal is a line that runs parallel to another line.

A transversal is a line that bisects three angles.

A transversal is any line in three-dimensional space.

It creates angles such as corresponding angles, alternate interior angles, and alternate exterior angles.

It creates only isosceles triangles.

It creates parallel segments perpendicular to the transversal.

It creates intersecting lines that form right angles.

Corresponding angles are angles that are in the same relative position at each intersection where a transversal crosses two lines.

Corresponding angles sum up to 360 degrees.

Corresponding angles are angles that always point downwards.

Corresponding angles are angles that have different measures.

In parallel lines, corresponding angles are equal.

In parallel lines, corresponding angles are always 90 degrees.

In parallel lines, corresponding angles add up to 180 degrees.

In parallel lines, corresponding angles are opposite angles.

Alternate interior angles are pairs of angles on opposite sides of the transversal but inside the two lines.

Alternate interior angles lie outside the lines being intersected.

Alternate interior angles are always adjacent to each other.

Alternate interior angles are created between non-parallel lines.

Alternate interior angles are equal when the lines are parallel.

Alternate interior angles are complementary in all cases.

Alternate interior angles sum up to 270 degrees when the lines are parallel.

Alternate interior angles are unequal regardless of line type.

Alternate exterior angles are pairs of angles on opposite sides of the transversal but outside the two lines.

Alternate exterior angles are formed inside the parallel lines.

Alternate exterior angles never exist when lines are parallel.

Alternate exterior angles align with each other on the same side.

Alternate exterior angles are equal when the lines are parallel.

Alternate exterior angles are always acute angles.

Alternate exterior angles vanish when lines are parallel.

Alternate exterior angles are supplementary.

If a pair of corresponding angles are equal, then the lines are parallel.

If a pair of vertical angles are equal, the lines are parallel.

If a pair of angles sum to 360 degrees, the lines are parallel.

Parallel lines are determined using the bisector only.

A linear pair of angles is a pair of adjacent angles whose non-common sides are opposite rays.

A linear pair of angles are complementary angles.

A linear pair of angles are formed only between skew lines.

A linear pair of angles sum up to 90 degrees.

The sum of a linear pair of angles is 180 degrees.

The sum is always 90 degrees.

The sum becomes zero when lines are perpendicular.

The sum is undefined for non-parallel lines.

Consecutive interior angles are pairs of angles on one side of the transversal but inside the two lines.

Consecutive interior angles are outside all lines.

Consecutive interior angles alternate between two intersections.

Consecutive interior angles do not exist for parallel lines.

Consecutive interior angles are supplementary if the lines are parallel.

Consecutive interior angles are complementary when lines are parallel.

Consecutive interior angles never meet when lines are parallel.

Consecutive interior angles are always equal.

They are used in engineering, architecture, and designing roads, ensuring structures are level and even.

They are primarily used for artistic purposes.

They are useful only in geological mapping.

They have no practical use in real life.