Any parallelogram, including rhombus, but not including rectangle or square.
A quadrangle with all sides equal and no 90 degree angles is a rhombus
an irregular rhombus.
NOImproved Answer:-Yes a rhombus has equal opposite acute angles and equal opposite obtuse angles
A rhombus has 4 interior angles and opposite angles are equal
a rhombus or parrellegram
a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.