It is (or they are) unknown!
They can be different lengths. YOU say they can be shown in different lengths but i need to know what particular lengths
First of all Its "What is unkown math" and it is math that isunknown DDUUHH!!
A trapezoid has one pair of opposite parallel sides of different lengths.
It is a trapezoid that has one pair of opposite parallel sides of different lengths
A trapezoid.
A trapezoid has 1 pair of opposite parallel lines of different lengths
The maths coordinate pair does nothing. It just is.
Scissors come in many different lengths.
unknown by me
A trapezium or a trapezoid has one pair of parallel sides of different lengths but an isosceles trapezium also has one pair of parallel sides of different lengths but its sloping sides are equal in length.
Since "Tongs" is not a Math Term, you must mean, "A Pair"....TWO. Like 'pair of scissors' and 'pair of trousers' though, you don't have just 'a tong', a 'pair of tongs' means one set of tongs.
A trapezoid has only one pair of parallel sides of different lengths.