Find the area of a triangle with vertices (-2,2), (1,5) and (6,-1). a. -16.5 b. 33 c. -33 d. 16.5

The solution in the attachment (two methods)

D. 16.5 u²

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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.