1.

If ABCD is a quadrilateral whose diagonals AC and BD intersect at 0, 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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