In a â–¡ABCD, which of the following options is true?
A
AB+CD+DA>2AC
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B
AB+CD+DA<2AC
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C
AB+BC−CD−DA<2AC
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D
AB+BC+CD+DA>2AC
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Solution
The correct option is DAB+BC+CD+DA>2AC
In △ABC, we have sum of two sides > third side =>AB+BC>AC ...(1) Also, in △ACD, we have sum of two sides > third side =>AD+CD>AC ...(2) Adding equations 1,2 we get =>AB+BC+CD+AD>2AC