Parallelograms (and their special cases), isosceles trapezium.
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Parallelograms (if the equal sides are opposite one another) or kites (if they are adjacent).
All quadrilaterals have two [pairs] of opposite sides and in most cases they are not equal.
Quadrilaterals are called parallelograms ONLY if both pairs of opposite sides are equal and parallel to each other.
yes and no. both are quadrilaterals and polygons,but a square has all equal sides while a rectagle doesnt have all equal sides only opposite sides are equal.
For quadrilaterals, it would be a rectangle, a square, or a rhombus. Two sides of an isosceles triangle are also equal.