The director used Dutch angles throughout the film to create a sense of unease.

The complementary angles at the intersection of the two lines measured 30° and 60°.

When a transversal crosses two parallel lines, the alternate angles formed on opposite sides of the transversal are equal, so you can use them to prove triangles are congruent.

In the diagram, the two supplementary angles are marked with different colors to show they sum to 180 degrees.

In the homework, I identified the supplementary angles and used their relationship to find the missing measure.

When solving the problem, remember that complementary angles often appear in right triangles.

The carpenter checked that the cabinet doors met at perfect right angles before installing the hardware.

The sum of the exterior angles of any convex polygon is 360 degrees, regardless of the number of sides.

The central angles of the circle determine the size of each sector.

To determine whether the polygon is regular, she measured all the interior angles and compared them.