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Brian McLogan
Determining the sine of the sum of two angles
👉 Learn how to evaluate the sine of an angle in radians using the sum/difference formulas. To do this, we first express the given angle as a sum or a difference of two (easy to evaluate) angles, then we use the unit circle and the...
Virtual Nerd
What is the Triangle Sum Theorem?
If you add the value of the three interior angles in a triangle will it equal 180 degrees? Yes it will. The instructor illustrates and proves the Triangle Sum Theorem. Follow closely as she explains her proof.
Virtual Nerd
Virtual Nerd: How Do You Find a Missing Angle in a Triangle?
It's important to remember that the interior angles of a triangle always add up to 180 degrees. This tutorial shows you how to put this knowledge into an equation and solve to find a missing measurement. [4:22]
Virtual Nerd
Virtual Nerd: How Do You Find Missing Angles in a Quadrilateral With Variables?
Watch this tutorial to learn how to create an equation and solve it to find the missing measurements of the interior angles of a polygon. [5:32]
Art of Problem Solving
Art of Problem Solving: Angles Around a Point
Video tutorial uses examples to reinforce understanding of how to find the angles around a point. [2:26]