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Mathematics
Mathematics
Problem
In a quadrilateral
A
B
C
D
ABCD
A
B
C
D
,
∠
A
+
∠
C
=
180
∘
\angle A + \angle C = 180^{\circ}
∠
A
+
∠
C
=
18
0
∘
. What can you conclude from this information? a)
A
B
∥
C
D
AB \parallel CD
A
B
∥
C
D
b)
A
B
C
D
ABCD
A
B
C
D
is a parallelogram. c)
A
B
C
D
ABCD
A
B
C
D
is a cyclic quadrilateral. d)
A
C
⊥
B
D
AC \perp BD
A
C
⊥
B
D
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