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A trapezium has 1 pair of opposite parallel sides of different lengths. Note that sometimes a trapezium is called a trapezoid
Parallelogram, trapezoid, rhombus and a kite are some of them Note that a square and a rectangle have diagonals of equal lengths
The term is "perimeter", and it is the sum of the lengths of the sides. Note that if the object in question is a circle, the perimeter is called the "circumference."
I have an old 5£ note with two different serial numbers on the same side. What is its value?
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