Z1 and Z2 are supplementary angles. mZ1 is 4y + 7, and mZ2 is 9y + 4. Find m2.​

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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.