square
A Square!
Yes, a parallelogram has four sides and four internal angles, the opposite side lengths are equal and the opposite angles are equal.
Quadrilaterals
Yes
Equilateral
yes opposite angles are equal
Any parallelogram, including rhombus, but not including rectangle or square.
Clockwise from 'a' it will be at the bottom right hand side and it will have 4 equal sides with 2 equal opposite acute angles and 2 equal opposite obtuse angles.
NOImproved Answer:-Yes a rhombus has equal opposite acute angles and equal opposite obtuse angles
A parallelogram has 2 equal opposite acute angles and 2 equal opposite obtuse angles.
It has one pair of opposite angles that are equal but not two.