A triangle having all angles less than 90 degrees is a polygon having no parallel sides and all acute angles.
A polygon with two acute angles, two obtuse angles, and two pairs of parallel sides is known as a trapezoid (or trapezium in some regions). Specifically, it can be classified as an irregular trapezoid, where one pair of opposite sides is parallel, and the angles vary in measure. This configuration allows for the presence of both acute and obtuse angles while maintaining the parallel sides characteristic of trapezoids.
parallelogram
A rhombus (pushed over square) will give you 2 pairs of parallel, congruent sides, 2 acute angles and 2 obtuse angles.
triangle
It is a parallelogram.
A rhombus - or parallelogram.
A polygon with 4 or more sides can meet these requirements.
A parallelogram is a quadrilateral with opposite sides parallel and congruent.
A right trapezoid is a four-sided polygon with two right angles and two parallel sides.
A parallelogram has 2 pairs of parallel sides.
Trapezium!
parallelogram