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The co-ordinates of the vertex of a squa...

The co-ordinates of the vertex of a square ABCD are (1,2) and the equation of the diagonal BD is x+2y=10. Find the equation of other diagonal and the co-ordinates of the centre of the square.

A

`y-2x=0`

B

`2x+y=0`

C

`x+y=0`

D

None

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A
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