### Home > INT3 > Chapter 10 > Lesson 10.3.3 > Problem 10-194

10-194.

Use the Pythagorean Identity to determine the *x‑*coordinate of a point on the unit circle whose *y*‑coordinate is

At any point on the unit circle, the corresponding right triangle has a hypotenuse of 1.

If you know the length of the vertical leg and the hypotenuse, how can you solve for the horizontal leg?

For any right triangle, *a*² + *b*² = *c*².