## Chapter 9, Lesson 11

**9-11.A** identify trigonometric ratios in right triangles**With respect to right triangle PQR, which statements are true?**

**I** sin *R* = cos *Q* **II** cos *R* = sin *Q***III** tan *R* ● tan *Q* = 1

**(a)** I and II only **(b)** I and III only **(c)** II and III only **(d)** I, II, and III **9-11.B** use trigonometric ratios to find side lengths in right triangles

**9-11.C** use trigonometric ratios to find angle measures in right triangles** Find, to the nearest degree, the measure of the smaller acute angle of the right triangle whose sides measure 5 in., 12 in., and 13 in.**