Asked by Lian

In triangle XYZ,x=20.4,y=16.4,z=23.1,what is angle Z
Answered by MsPi_3.14159265
Because you know all three sides you can use the Cosine Law. z^2=x^2 +y^2 -2xycosz and re-arrange to get cosz all by itself. Then solve for the angle z
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