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Every four sided figure is a quadrilateral which includes a parallelogram.

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Square is a paralleagram

Q: Which counterexample shows that the conjecture Every four-sided figure is a parallelogram is false?

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if the diagonals of parallelogram become Perpendicular then the figure is said to be rhombus......

A parallelogram is a 2D figure with two parallel sides

There are many true statements which can made. One such is:"a parallelogram is a plane figure".

A parallelogram with one right angle has four of them. The name for this figure is a rectangle.

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A trapezium.

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a 4 sided figure * * * * * A four sided figure need no be a parallelogram. Think of a kite!

if the diagonals of parallelogram become Perpendicular then the figure is said to be rhombus......

A parallelogram is a 2D figure with two parallel sides

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No. Every triangle has 3 sides, and every figure with 3 sides is a triangle. So no triangle can be a parallelogram. Every parallelogram has 4 sides, and every figure with 4 sides is a quadrilateral. So no parallelogram can be a triangle.

There are many true statements which can made. One such is:"a parallelogram is a plane figure".

A rectangle (opposite sides are parallel which is a parallelogram!)

Parallelogram

A parallelogram is a two-dimensional figure, so it has two dimensions.

A rhombus, square, kite or arrowhead.