Angles

This 12-question quiz covers the basic types of angles and how they relate to one another.

You will work through fill-in-the-blank and true or false items, with prompts such as What angle measures exactly 90 degrees? and Which are complementary angles?

A simple way to keep two tricky terms straight is that complementary angles add up to 90 degrees while supplementary angles add up to 180, so the pair with the bigger total is the one for a straight line.

You will also confirm why the two sides of a right angle are called perpendicular.

Recommended level: beginner to intermediate.