Question

what is the angle btwn the 2 vectos:
u=(2,-1) v=(2,0)

Answer 1

The angle is atan(1/2) = approx 26.565 degrees.

Answer 2

ohh ill give u the formula we need to use

Answer 3

cos(x)=(u.v)/(||u||||v||)

Answer 4

Oh, then you want

u . v = 4 + 0 = 4
||u|| = sqrt(5)
||v|| = sqrt(4) = 2
cos(x) = 4/(2sqrt(5))
x = acos(4/(2sqrt(5)) = 0.46365 radians = 26.565 degrees.