## Elementary Geometry for College Students (5th Edition)

$23^{\circ}$
Using Pythagorean Theorem to find the length of hypotenuse. $\sqrt{5^{2}+12^{2}}=13$ $\sin\alpha=\frac{5}{13}$ $\alpha=\sin^{-1}\frac{5}{13}$ $\alpha\approx23^{\circ}$