From the top of the Ferris wheel, the angle of depression of your friend on the ground is 61º. If your friend is standing 30 feet from the foot of the ride, how tall is the Ferris wheel?

What mathematical statement is missing ? ? the answer is b

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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.