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

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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.

Alexander J. A Level Maths tutor, A Level Physics tutor

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