If ABCD is a quadrilateral whose diagondals AC and BD intersect at O,

1.	If ABCD is a quadrilateral whose diagondals AC and BD intersect at O, then:
A.	\[\left( AB+BC+CD+DA \right)<\left( AC+BD \right)\]
B.	\[\left( AB+BC+CD+DA \right)>2\left( AC+BD \right)\]
C.	\[\left( AB+BC+CD+DA \right)>\left( AC+BD \right)\]
D.	\[AB+BC+CD+DA=2\left( AC+BD \right)\]
Answer» D. \[AB+BC+CD+DA=2\left( AC+BD \right)\]

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If ABCD is a quadrilateral whose diagondals AC and BD intersect at O, then:

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