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All the sides of a trapezium are not equal. Only two sides, which are not parallel, of a trapezium can be equal and such type of trapezium is called isosceles trapezium.
A rhombus has all four sides of equal length, a trapezium may have none. A rhombus has two pairs of parallel sides, a trapezium has one. A rhombus has two pairs of equal angles (opposite angles), a trapezium may have none.
No
A quadrilateral is any plane figure bounded by four straight lines. Within this definition are special shapes. The Parallelogram : has both pairs of opposite sides parallel (and opposite sides are equal in length). The Rhombus : is a parallelogram with all its sides of equal length. The Rectangle : is a parallelogram with each of its vertex angles equal to 90° (and opposite sides are of equal length). The Square : is a rectangle with all its sides of equal length. The Trapezium : is a quadrilateral with only one pair of parallel sides - which are NOT of equal length. The Isosceles Trapezium : is a trapezium with its two non parallel sides equal in length. The Kite : is a quadrilateral with two pairs of adjacent sides equal in length
In a parallelogram, both pairs of opposite sides are parallel and equal. In a trapezoid (UK trapezium), only one set of sides is parallel, and the sides may all have unequal lengths, or two sides may have equal length with equal and opposite angles (this is routinely called an isosceles trapezoid).