SOLUTION: I have a right triangle. a=2 and b=4 what does Cos(A)=? I am having trouble with the problem. I know Cos(A)= b/c so i have to figure out what c= i believe? Thanks for the help.

Question 86487: I have a right triangle. a=2 and b=4 what does Cos(A)=?
I am having trouble with the problem. I know Cos(A)= b/c so i have to figure out what c= i believe? Thanks for the help.
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!
I have a right triangle. a=2 and b=4 what does Cos(A)=?
I am having trouble with the problem. I know Cos(A)= b/c so i have to figure out what c= i believe? Thanks for the help

Yes, you have to calculate c using the Pythagorean theorem:
= +
= +
= 4 + 16
= 20
c =
c =
c = 2

so cos(A) = = = = =

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