8) The sizes, in degrees, of the angles of the triangle below are 3a, a+7 and a+28. 3a
a +7
a+28
a) Use this information to write down an equation in terms of a.
b) Use your answer to part a) to work out the value of a.​

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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.