1.

`ABCD` is a quadrilateral. Is `AB+BC+CD+DA > AC+BD ?`

Answer» `In/_ABC And /_ACD`
AB+BC>AC
CD+DA>AC
From these equations
AB+BC+CD+DA>2AC-(1)
Similarly,
AB+BC+CD+DA>2BD-(2)
From equation 1 and 2
2(AB+BC+CD+DA)>2(AC+BD)
AB+BC+CD+DA>AC+BD.


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