Grayson is designing a rectangular athletic field. on a scale drawing the vertex of the rectangle are (4, 5), (9, 10) ,and (9, 5). what are the coordinates of the fourth vertex?
a. (4, 9)
b. (4, 10)
c. (5, 10)
d. (5, 9)

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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.