Answer:
a = 5.3
<C = 42°
Explanation:
<C = 180 - (60 + 78)
Law of sines:
a/sin(60) = 6/sin(78)
a = sin(60)*6 / sin(78)
a = 0.866 * 6 / 0.978
So the total value of a triangle is 180°
So when u calculate the missing angle its value is 42°
180°-(60°+78°) = 42°
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