Answer:
if the shape is a triangle, just find the 3rd number and they should all add to 180 degrees.
m ∠Y = 39°
Explanation:
The sum of all angles in a triangle is 180°, so you just have to add m∠Z and m∠X, which will be 113 + 28 = 141. 180 - 141 = 39°
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