not sure where the finance comes in here, but
did you draw RST? If so, it should be clear that
cosR = adjacent/hypotenuse = RT/RS = 12/13
In right triangle RST, ST = 5, RT = 12, and RS = 13.
find cos R
(i'm not able to show a pic sorry!)
4/13
12/5
12/13
5/12
2 answers
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