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

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


Is every rectangle a square using counterexample?

Every square is a rectangle, but not every rectangle is a square.


Is every parallelogram is also a rectangle?

No. Most parallelograms are not rectangles. But every rectangle is a parallelogram.


Is every parellelogram a rectangle?

No. Every parallelogram is not a rectangle but every rectangle is a parallelogram.


Is every parllelogram a rectangle?

No, but every rectangle is a parallelogram.


Is a parrallelogram a rectangle?

Yes, a rectangle is a special case of a parallelogram, where each of the 4 angles = 90°


Can a rectangle not be a parallogram?

No, it can't not be. Every rectangle is a parallelogram.


Can every rectangle be a parallelogram?

Well, a rectangle is defined as having two sets of parallel sides and four right angles, a parallelogram is defined as having two sets of parallel sides and two sets of supplementary angles. Therefor, a rectangle is always, by definition, a parallelogram. A parallelogram is not always a rectangle, but it can be.


Is th paralleloram a rhombus or a Rectangle?

I hope you know the definition of the parallelogram. i.e.,In geometry, a parallelogram is a quadrilateralwith two sets of parallel sides.so naturally rhombus and rectangle are special case of parallelogram. That means every rhombus is parallelogram similarly every rectangle is a parallelogram. But converse need not be true.So parallelogram not necessarily a rhombus or a rectangle.GMG.


What are three different names for a rectangle?

Every rectangle is also a parallelogram and a quadrilateral.


Is every parallelogram's a rectangle?

yes, as long as 2 sides are parallel, its a parallelogram.


Are consecutive angles in a parallelogram always congruent?

Not unless the parallelogram is a rectangle. In every parallelogram, consecutive angles are supplementary.