Mathematics, 20.04.2021 23:40, fireemblam101ovu1gt

Can someone please help me solve this prob it says Solve for Theta and its a triangle with 9 on the adj side and 12 on the hypo side so im guessing the equation would be cosθ=9/12 can some one finish it and explain it because I'm very confused?

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Can someone please help me solve this prob it says Solve for Theta and its a triangle with 9 on th...