You skipped 4 and 9. Couldn't remember those, could you?

At one time I knew pi to thirty places. Then I read somewhere that it really doesn’t need to be that precise. So for example, if you were measuring the circumference of the earth using π = 3.14159 vs π = 3.141592653589793 it only changes the circumference by fractions of a millimeter at this scale. I can’t measure a 24 inch piece of wood with that amount of accuracy.

Why don't you know 7, also 6 is wrong

Alpha Beta Gamma Delta Epsilon Zeta Eta Theta Iota Kappa Lambda Mu Nu Omicron? ? Rho Tau Sigma Upsilon Phi Chi Psi Omega

Edit: Forgot about Xi and Pi, before and after Omicron respectively. Also swapped Tau and Sigma's position.