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.