### Home > PC > Chapter 11 > Lesson 11.1.2 > Problem 11-23

11-23.

Using the diagram, cos(*θ*) = *x*/*r*.

Using the diagram, sin(*θ*) = ?

What theorem can be used to relate the three sides of a right triangle?

Use tangent.

11-23.

Using the diagram, cos(*θ*) = *x*/*r*.

Using the diagram, sin(*θ*) = ?

What theorem can be used to relate the three sides of a right triangle?

Use tangent.