Points A, B, and C are plotted on the unit circle. Which of the coordinates is equal to cos(50 degree)

We just started the introduction into circles and i have no idea how to do this.

Elizabeth is using a sample to study american alligators. she plots the lengths of their tails against their total lengths to find the relationship between the two attributes. which point is an outlier in this data set?

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?