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Since AB and CD are parallel and a transversal crosses them.
<S = <V (vertically opposite angles)

<W = <Z (vertically opposite angles)
Also,
<S = <W (corresponding angles)

So <S = <V = <W = <Z

So, S is equal to all 3 mentioned angles.

Answer is E

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1. S and V form vertically opposite angles
S = V

2. S and W form corresponding angles
S = W

3. S and Z form alternate exterior angles
S = Z

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Bunuel

In the figure above, AB is parallel to CD. Which of the following must be equal to s ?

I. v
II. w
III. z

A. I only
B. II only
C. I and II only
D. II and III only
E. I, II, and III

Attachment:
1.jpg


s = v (opposite angles)
w = z (opposite angles)

s = w (corresponding angles)

s = v = w = z

IMO E
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