Bunuel wrote:
In the figure above, what is x + y in terms of z?
(A) 180 – z
(B) 180 + z
(C) z – 180
(D) z + 180
(E) z
[Reveal] Spoiler:
1. Vertical angle
The unnamed angle inside the triangle and z are congruent vertical angles.
Sum of interior angles of a triangle = 180
x + y + z = 180
x + y = 180 - z
2. Adjacent to exterior angle
z is on the same line as an exterior angle of the triangle, call it w, whose
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