1.

In the parallelogram ABCD, overline(AD)^(2) - overline(AB)^(2) =

Answer»

`4 overline(AB)`. (orthogonal PROJECTION of `overline(AD)` on `overline(AB)`)
`2 overline(AB)`. (orthogonal projection of `overline(AD)` on `overline(AB)`)
` overline(AC)`. (orthogonal projection of `overline(BD)` on `overline(AC)`)
`2 overline(AC)`. (orthogonal projection of `overline(BD)` on `overline(AC)`)

Answer :C


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