xxmini: I'm pretty sure a circle.
a trapezoid
It is a trapezoid. If the 2 nonparallel sides are congruent, then it is an isosceles trapezoid.
Parallelogram -- 2 pairs of parallel sides Trapezoid -- exactly 1 pair of parallel sides Rhombus -- 4 congruent sides Rectangle -- 4 angles congruent Square -- four angles and sides congruent
Parallelogram -- 2 pairs of parallel sides Trapezoid -- exactly 1 pair of parallel sides Rhombus -- 4 congruent sides Rectangle -- 4 angles congruent Square -- four angles and sides congruent
A parallelogram.
It depends on whether the congruent sides are the non-parallel ones (an isosceles trapezium) or a pair of adjacent sides (no special name).
It is a shape which has two pairs of PARALLEL sides. Parallel sides - parallelogram. Get it?
Parellelogram
A trapezoid has two parallel sides.
Trapezium
trapezoid
parallelogram