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Find the all the angles of a triangle with side lengths of 8cm, 11cm and 11cm.

Using the knowledge of a² = b² + c² - 2bcCos(A)

Rearrange to aquire Cos(A) = (b² + c² - a²)/2bc

Then input the values to obtain the angles of 42, 69, 69.

Answered by Alexander J. • Maths tutor

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