what formula do you use when you have all three sides of a triangle and need to find an angle

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Guest Jun 9, 2015

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Best Answer

You could use the cosine rule:

$\cos A=\frac{b^2+c^2-a^2}{2bc}$

where A is the angle opposite side of length a, and b and c are the lengths of the other two sides.

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Alan Jun 10, 2015

Alan · Answer 1 · 2015-06-10T07:02:03

You could use the cosine rule:

$\cos A=\frac{b^2+c^2-a^2}{2bc}$

where A is the angle opposite side of length a, and b and c are the lengths of the other two sides.

.