Question

For an angle Θ with the point (−20, −21) on its terminating side, what is the value of cosine?

Answer 1

1. Plot the point
2. draw a line from the origin to the point
3. make a triangle (draw a vertical line from the point to the x-axis
4. Label the lengths of the sides (x distance and y distance)
5. Figure out the length of the hypotenuse. use x^2 +y^2 = h^2
6. cos will be adjacent / hypotenuse