Coordinates of the vertices of a quadrilateral are $(2, -1), (0, 2), (2, 3)$ and $(4, 0)$. The angle between its diagonals will be
Coordinates of the vertices of a quadrilateral are $(2, -1), (0, 2), (2, 3)$ and $(4, 0)$. The angle between its diagonals will be
- [IIT 1986]
- A
${90^o}$
- B
${0^o}$
- C
${\tan ^{ - 1}}(2)$
- D
${\tan ^{ - 1}}\left( {\frac{1}{2}} \right)$
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- [IIT 1981]
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