A line or segment that divides an angle into two equal parts.

Two angles whose measures add up to 90 degrees.

A triangle in which one of the angles measures exactly 90 degrees.

A pair of angles that are opposite each other when two lines intersect, and they are equal in measure.

Two angles that are on the same side of a transversal and between two parallel lines.

A line that is perpendicular to a segment at its midpoint, dividing it into two equal parts.

A line that intersects two parallel lines at distinct points, creating various angle relationships.

Angles that are formed when two lines intersect and are in corresponding positions.

Angles that lie on opposite sides of the transversal and within the two parallel lines, and are equal in measure.

A pair of angles that are located outside the parallel lines but on opposite sides of the transversal.

The middle point of a line segment, equidistant from both endpoints.

A line segment that connects a vertex of a triangle to the midpoint of the opposite side.

Two angles next to each other on a straight line adding up to 180.