Module 5 Lesson 3

Vertical Angles

When 2 lines cross, vertical angles are the angles across from each other.Vertical angles are congruent.

What are vertical angles?

The angles represented by A are verticalThe angles represented by B are vertical

Try this easy one…

What is the measure of Angle A?

78!Since vertical angles are congruent, angle A is 78.

The answer is…

Maybe a little harder…

Solve for x.

X=86!Since vertical angles are congruent, you know x+9=95. Solve for x by subtracting 9.

And the answer is…

Ok, try this one…

A=5x-17 and C=2x+19. Find the measure of angle A.

43 degrees!Since the angles are vertical, you set them equal to each other. 5x-17=2x+19Solve for x and get 12.Plug it in (it asks for the angle not x) to get 43.

Answer…