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Which relationship is always true for the angles r, x, y, and z of triangle ABC?

x + z = y
180 degrees − x = r
x + y + z = 180 degrees
x + y + z = 90 degrees

I don't think its c. because there is an exterior angle. I think it would be b.

Which relationship is always true for the angles r, x, y, and z of triangle ABC? x-example-1
User Ingulit
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2 Answers

2 votes

The answer of this question is A

User Riccardo Murri
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3 votes

That's the second one,


180 - x = r


Whenever two lines cross we get congruent opposite angles and supplemental adjacent angles, i.e. they add to 180 degrees.


The first one is almost right; we have r+y+z=180 and r+x=180 so x=y+z not quite what was written.


User KOLANICH
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