Isogon

14 clues
Square, e.g.
Equiangular shape
Rectangle, for one
Equiangular figure
Rectangle or square
Figure with equal angles
Equilateral triangle, e.g.
Equiangular geometric shape
Equiangular geometric figure
Equiangular geometrical shape
Equilateral triangle, for one
Equal-angled geometric figure
Geometric figure with equal angles
Geometric figure with all equal angles