What is the name of this geometrical shape?

Correct answer: Antiparallelogram

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What people think about it: 4 Comments
alaalias
alaalias
First time I hear about this. And I am a mathematician too.
Mars V
Mars V
The other three were wrong so I picked the oddball. I’ve been a math teacher for 30+ years. I’ve never heard of this.
RushMama2112
RushMama2112
It's good to know that mathematicians don't know about this, either.
SPRITE
SPRITE
Angles of an antiparallelogram: An antiparallelogram (also called a contraparallelogram) is a quadrilateral in which two pairs of opposite sides are of equal length, but one pair of opposite angles is supplementary (adds up to 180°). Total Angle: For any quadrilateral, the sum of the interior angles is always 360°. This is true for antiparallelograms as well. Key Property: In an antiparallelogram, the angles alternate between acute and obtuse, with one pair of opposite angles being supplementary. (the opposite angles are equal but oppositely oriented.)