A triangle has one side with the length of $7cm$, another side with the length of $5cm$, and another side with the length of $9cm$. I need to find the angles of the triangle but I don't know where to start, any help is greatly appreciated.
2026-03-25 03:03:05.1774407785
I know 3 sides of a triangle and I'm trying to find the angles
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Just apply the cosine rule, which states that: $$a^2=b^2+c^2-2bc \cos A$$
Just substitute the lengths of the three sides into the equation to find the angles. Remember that if you let $a=7$, you will be finding the angle opposite the side of length $7$