## Trigonometry 7th Edition

$\theta$ = $12.3^{\circ}$
Given, $\cos\theta$ = $0.9770$ Therefore- $\theta$ = $\cos^{-1} 0.9770$ Using calculator in degree mode-(0.9770 → $\cos^{-1}$) $\theta$ = $(12.312251506) ^{\circ}$ On rounding to the nearest tenth of a degree- $\theta$ = $12.3^{\circ}$