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04-12-2017
Mathematics

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What happens to the Law of Cosines if the known angle is 90 degrees?

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Аноним Аноним

14-10-2019

Answer:

See below.

Step-by-step explanation:

It transforms to the Pythagoras theorem.

c^2 = a^2 + b^2 - 2ab cos C

If C = 90, cos C = zero so the last term disappears.

c^2 = a^2 + b^2 - 2ab * 0

c^2 = a^2 + b^2.

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