### Home > PC > Chapter 11 > Lesson 11.2.1 > Problem 11-70

11-70.

Graph the point.

Draw a right triangle with the *x*-axis.

'*r*' is the length of the hypotenuse of the triangle. Calculate '*r*' by using the Pythagorean theorem.

Use trigonometry to find the angle marked *α*.

Use the measure of angle *α* to find *θ*.