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Clarified
* The perimeter is equal to the sum of the oblique sides plus the sum of the tangent sides.
* The perimeter is equal to the sum of the oblique sides plus the sum of the tangent sides.
* The sum of the oblique angles will be equal to the sum of the tangent angles.
* The sum of the oblique angles will be equal to the sum of the tangent angles.
In England, such a shape is called a trapezium.<ref>"Trapezium". ''Britannica Online Dictionary''.</ref>
[[Category:Plane Geometry]]
[[Category:Plane Geometry]]