### Home > INT3 > Chapter 9 > Lesson 9.1.4 > Problem 9-54

9-54.

A 70º angle is drawn for you in the unit circle below. Homework Help ✎

Approximate the coordinates of point

*R*.How could you represent the

*exact*coordinates of point*R*?Show that the Pythagorean Identity works for this angle.

(0.3420, 0.9397)

(cos(70°), sin(70°))

sin^{2}(*θ*) + cos^{2}(*θ*) = 1