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Show that the points (1,\ 7),\ (4,\ 2),\...

Show that the points `(1,\ 7),\ (4,\ 2),\ (-1,\ -1)\ a n d\ (-\ 4,\ 4)`are the vertices of a square.

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Let the vertices are `M(1,7),N(4,2) R(−1,−1),Q(−4,4)`
`MN= sqrt[(1−4)^2 +(7−2)^2]` ​
...
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