Question 1088895
Use Pythagorean theorem to find the length of the missing side. then find indicated trigonometric function of the given triangle . give a exact answer with a rational denominator 

right triangle


theta of B


a=5
b=2

I started to do this question 

c^2=5^2+2^2
c^2=25+4
c^2=29
c=Sqrt of 29 

after that i am confused?
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It's done
c = sqrt(29)
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IDK what "theta of B" means.