1.

Let AD be a median of the DeltaABC. If AE and AF are medians of the triangle ABD and ADC respectively, and AD=m_(1), AE=m_(2), AF=m_(3), then a^(2)//8 is equal to

Answer»

`m_(2)^(2)+m_(3)^(2)-2m_(1)^(2)`
`m_(1)^(2)+m_(2)^(2)-2m_(3)^(2)`
`m_(1)^(2)+m_(3)^(2)-2m_(2)^(3)`
None of these

Answer :A


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