Math Antics
Angle Basics
Right, acute, obtuse, complementary, and supplementary angles.
Watch on YouTubeUse complementary, supplementary, vertical, and adjacent angles to find unknowns.
Read this first — it covers the idea in plain language with a worked example.
Two angles are supplementary. One is 110°. Find the other.
Set up an equation
When an unknown angle is part of a relationship, write an equation (like x + 110 = 180) and solve.
A short video that walks through this topic.
Right, acute, obtuse, complementary, and supplementary angles.
Watch on YouTubeTry a worksheet or work through some problems before the quiz.
A couple of questions to make sure this topic stuck. Retake as many times as you want.
Angle Relationships
An angle is complementary to a 35° angle. What is its measure?