Since the angles in triangle ACM indicate that it is a 30-60-90 triangle, we know that the other two sides of triangle ACM are 20 and 10 (30-60-90 triangles have a very specific side coefficient). This means that the sides of this triangle have side lengths 40, 10, and 
. Adding these together you get 50+. Hope this helps!
ZX bisects ∠WZY. If the measure of ∠YXZ is (6m – 12)°, what is the value of m?
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