4 Solve for z in the following figure and choose the appropriate result.
A 75
B) 30
C 90
D 45
O
22
010

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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.