Question: theta is an acute angle of a right triangle. Find the values of the 2 other trig ratios of theta.

cos θ = 8

After doing the work to find out what the other leg is using the Pythagorean theorum, I got a^{2}= -63, making the missing leg an imaginary number. Am I doing something wrong? Thanks in advance.

Update: It does say that cosine=8 even though cosines can not be more than 1.

IneedHealing Apr 25, 2017