Which relationship is always true for the angles r, x, y, and z of triangle ABC?
A triangle is shown with a leg extending past the top vertex. The vertices are labeled ABC. Angle y is located inside the triangle at vertex B. Angle z is located inside the triangle at vertex C. Angle x is located outside the triangle between beside vertex A and the extended leg. Angle r is located inside the triangle at vertex A.
x + z = y
180 degrees − x = r
x + y + z = 180 degrees
x + y + z = 90 degrees

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here angles r, y, and z are interior angles, so we have:
m

I have a feeling the answer is B

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