Chapter 1.3, Problem 25E

Evaluating Trigonometric Functions of $30°,45°,$ and $60°$ In Exercises 23-28, construct an appropriate triangle to find the missing values. $\left(0°\le \theta \le 90°,0\le \theta \le \pi /2\right)$

$\begin{array}{l}\begin{array}{cccc}\text{Function}& \theta \left(\text{deg}\right)& \theta \left(\text{rad}\right)& \text{Function Value}\end{array}\\ \begin{array}{cccc}\mathrm{\hspace{0.33em}\hspace{0.33em}\hspace{0.33em}\hspace{0.33em}\hspace{0.33em}\hspace{0.33em}\hspace{0.33em}\hspace{0.33em}\hspace{0.33em}sin}& \boxed{}& \frac{\pi }{4}& \boxed{}\end{array}\end{array}$