Angle a and angle c or protocol angles if m angle a equals 3x + 7 degrees and m angle c equals x + 53° what is the value of x

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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.