How do you measure an angle in a triangle using the length of the sides of the triangle?


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To measure an angle in a triangle when giving the 3 sides of the triangle you use the cosine rule to find the largest angle. The cosine rule is c^2 = b^2 +a^2 - 2bacosC where C is the angle and you plug in the lengths of the sides for a, b, and c.

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