a tapezium
parallelogram
Angles are usually illustrated as two acute and two obtuse, but there can be two right, one acute and one obtuse. Angles cannot be parallel since that is a characteristic of lines, not angles!
A rhombus (pushed over square) will give you 2 pairs of parallel, congruent sides, 2 acute angles and 2 obtuse angles.
A rhombus - or parallelogram.
trapezoid
a tapezium
parallelogram
A square
Parallelogram.
Angles are usually illustrated as two acute and two obtuse, but there can be two right, one acute and one obtuse. Angles cannot be parallel since that is a characteristic of lines, not angles!
A rhombus (pushed over square) will give you 2 pairs of parallel, congruent sides, 2 acute angles and 2 obtuse angles.
polygon
A rhombus - or parallelogram.
A triangle having all angles less than 90 degrees is a polygon having no parallel sides and all acute angles.
Trapezium!
a rombus