Question

What is the measure of an angle if the hypotenuse is 13 and adjacent side is 12?

Answer 1

`cos(\theta)=\cfrac{\stackrel{adjacent}{12}}{\underset{hypotenuse}{13}}\implies cos^(-1)[cos(\theta)]=cos^(-1)\left( \cfrac{12}{13} \right) \\\\\\ \theta =cos^(-1)\left( \cfrac{12}{13} \right)\implies \theta \approx 22.62^o`

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