A trapezium is considered to be a regular shape. The trapezium is referred to as a regular polygon which has all sides equal.
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rectangle, square, equilaterals, rhombus, kite, trapezium
Trapezium
Trapezium
A trapezium can have either 0 or 1 line of symmetry, depending on its specific shape. If the trapezium is a parallelogram, it will have one line of symmetry, which is the line that divides the shape into two equal halves. However, if the trapezium is not a parallelogram, it will have no lines of symmetry, as there is no way to divide it into two equal halves through a single line.
A trapezium is a 2D shape; volume it an attribute of 3D shapes. The volume of all trapezia is 0.