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What thirteen letter shape has 2 pairs of parallel sides 4 right angles but sides are not all the same length?
The geometric answer is a rectangle but that does not have 13 letters. The answer is NOT a quadrilateral nor parallelogram because neither of them need have 4 right angles.
Is a quadrilateral also a parallelogram?
It may be. A quadrilateral has four sides, but they need not be all the same length, nor parallel to each other. It's true that a parallelogram *is* a quadrilateral.
Is a quadrilateral with one right angle necessarily a rectangle?
A quadrilateral can have two right angles and still not be a rectangle, if one side is oblique (neither right nor parallel) to the others, but three right angles force the fourth, and you have a rectangle.
Does a circle have 4 sides?
NO! DEFINITELY NOT!!! A circle has NO sides at all! A quadrilateral has four sides. A quadrilateral is a polygon with four sides. For example: the square, the rhombus, the rectangle etc.. A circle measures 360 centimetres in circumference. This so because there has to be some way to measure the circle, and mathematicians came up with this strategy, I don't know how (yet). The point is the circle cannot have sides or angles because it is completely round, and a round figure cannot have sides nor angles.
What is a polygon with 4 sides none of which is the same length?
An irregular QUADRILATERALOrAn irregular QUADRANGLE(closed figures in Euclidean space have the same number of edges (sides) and angles ).Note:In American (and some other, but not European English usage) Trapezium is a general (or irregular) quadrilateral (no parallel edges or edges necessarily of equal length nor therefore any requirements on equal angles) A Trapezoid in the US has two parallel edges and thus complementary angles at the ends of the non-parallel edges.The trapezoid and trapezium both might have up to 3 sides of the same length since the term trapezoid only is used to describe the number of parallel edges and the term trapeziumonly to describe the number of edges (and necessarily the number of angles).
