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Mathematics
Problem
In quadrilateral
W
X
Y
Z
WXYZ
W
X
Y
Z
, it is known that
W
X
∥
Z
Y
WX \parallel ZY
W
X
∥
Z
Y
and
W
X
=
Z
Y
WX = ZY
W
X
=
Z
Y
. Which of the following must be true? a)
W
X
⊥
Z
Y
WX \perp ZY
W
X
⊥
Z
Y
b) Diagonals
W
Y
WY
W
Y
and
X
Z
XZ
X
Z
bisect each other c) Diagonals
W
Y
WY
W
Y
and
X
Z
XZ
X
Z
are equal in length d) All sides of quadrilateral
W
X
Y
Z
WXYZ
W
X
Y
Z
are equal
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