A parabola has a directrix of y=8 and a focus of ( 0,2) what are the coordinates of the vertex of the parabola use of the grid below is optional show that point (12,-7) must lie on the parabola

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.