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The only terms that definitely apply are "quadrilateral" (or more specifically an "incongruent quadrilateral") and "quadrangle."
The polygon may also be a trapezoid or a trapezium, but it is also possible to have a trapezoid or trapezium with two sides equal. Also note that the British and American definitions of trapezoid and trapezium are exactly reversed: an American trapezoid is a British trapezium, and a British trapezoid is an American trapezium.
A polygon with 4 sides is called a quadrilateral. There is no special name to indicate that it has no two equal sides.
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I am a polygon I am a quadrangle all of my sides are the same length but none of my angles are right angles - what am I?
You are a rhombus.
Polygon with sides and angles that are not congruent?
a polygon with 4 right angles and 4 sides of the same length
Is a rectangle an irregular polygon?
Yes. Unless it happens to be a square, not all sides have the same length - and the definition of a regular polygon includes having all sides of the same length.
What is special about regular polygon?
All the sides are the same length
Is an isosceles triangle a regular polygon or a irregular polygon?
It is irregular as not all the sides have the same length.
