Find the 6 trigonometric values of theta= cos^-1 (3/7)

Now I was thinking cos^-1 = (3/7) is equivalent to secant=3/7 right? Meaning cosine would be 7/3. I draw my triangle, and solve for the last side by using pythagorean theorem. When I have all three sides I can identify my remaining 4 trigonometric values. Is this right?