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Question

Which of the following conditions are necessary and sufficient for a quadrilateral to be a square?

(1)All sides are of same length

(2) All angles are equal

(3) Diagonals are perpendicular to each other

(4) Diagonals are of same length

(5) Opposite sides should be parallel


A

1 and 3

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B

2 and 4

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C

3 and 4

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D

1 and 5

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Solution

The correct option is C

3 and 4


We can find exceptions for options (a), (b), (d) where by the conditions given we can construct a quadrilateral which is not square.

(a)All sides same length, diagonals perpendicular A Rhombus is also possible

(b)Angles equal, equal diagonals lengths A rectangle satisfies this condition.

(c)Diagonals perpendicular to each other and of same lengths.

Only a square can be constructed using this condition.

(d)Sides are equal and opposite sides are parallel.

A rhombus is possible with given condition.


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