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Measure the three sides using a ruler. Then use the Cosine Rule.

If the sides are a, b and c cms, then to calculate angle C, the cosine rule is

c2 = a2 + b2 - 2abCos(C)

So, calculate [a2 + b2 - c2]/2ab

and then calculate cos-1 of the result.

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14y ago

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