Observe that for each of the four points in the figure r 1 Find the value of cos 1800 using the appropriate values of x y and r from the graph on the right www Select the correct choice below and fill in any answer boxes in your choice O A cos 1800 Simplify your answer including any radicals Use integers or fractions for any numbers in the expression B The solution is undefined y x 0 0 1 y 1 7 1 x 1 y 0 r 1 1 0 0 1 0 x 1 y 0 r 1 x 0 y 1 0 1 r 1