Law Of Cosines: Cosine Law
When to Use it?
The above chart shows how to use cosin
e law to solv
e for
different things: (IE) the box on the top left side formula solves for a(side), the one below it for b(side) and the one below that for c(side). Across the table is the corresponding formulas for angles A, B, and C.
Scenario 1 (of 2) triangle shows that a (side) = 13, c (side) = 20) and B (angle) = 103(degrees) and are looking to find b (side).
Scenario 2 (of 2) shows finding the angle A
Similar triangles – they have the same shapes but different lengths(or distances)
Summary : Use the law of cosines if you have Two Sides and the Included Angle, OR All Three Sides.
"The inverse cosine of the cosine is the angle itself."
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