Exactly how many planes contain points J, K, and N?
A. 0
B. 1
C.2
D.3

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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.

Add the cents that add the left overs to get the first number