1.

Two circles are such that one is inscribed in and the other is circumscribed about a square A _(1), A _(2), A _(3), A_(4), If the length of each side of the square is a and P, Q are two points respectively on these circles, then |sum_(i =1) ^(4) (PAi) ^(2) -sum_(i =1) ^(4) (AQi) ^(2) |=

Answer»

`a ^(2) //4`
`a ^(2) //2`
`a ^(2) `
`2A^(2)`

ANSWER :C


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