Question

What equilateral shape has opposite sides but no right angle

Answer 1

rhombus or parallelogram.

Answer 2

Only the rhombus,
equilateral means equal,
a parallelogram does not necessarily have 4 equal sides

Answer 3

Or, any regular n-gon with more than 4 sides and n an even number.

Answer 4

Thanks Steve,
e.g. a regular hexagon or octogon , etc