A cone with a base area of 138 inches squared and a height of 22 inches is sitting on its base. Find the area of the vertical cross section (cut from the top of the cone to the bottom) of the cone.

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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.

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