Question

If the point (x, sqrt 3/3 is on the unit circle, what
is x?

a. 2/3
b. sqrt6/3
c. 4/9
d. sqrt 2/3

Answer 1

In a unit circle, the first coordinate is cos(theta) and the second coordinate is sin(theta).
Here sin(theta) = sqrt(3) / 3. Use this info to find cos(theta) which will be your x.

Answer 2

i got 1/3 i dont think im doing this right.

Answer 3

You can make use of the trig identity: sin^2(theta) + cos^2(theta) = 1 to find cos(theta)

Answer 4

what is theta