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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.

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

1 year ago

Answered by Alexander, an A Level Maths tutor with MyTutor


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Alex C.

Degree: Natural Sciences (Bachelors) - University College London University

Subjects offered: Maths, Physics+ 3 more

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Degree: Mathematics Msci (Bachelors) - Bristol University

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Ellen H.

Degree: Mathematics (Bachelors) - Bristol University

Subjects offered: Maths, English Literature+ 2 more

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“Hello! My name is Ellen, and I'm a first year Mathematics student at the University of Bristol. I love maths, and I know that while it can be intriguing, it can also be challenging! I'm here to help in any way I can, whether that's ex...”

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Alexander J.

Degree: Physics (Masters) - Exeter University

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