Yes
A square.
A trapezoid
square. rotate a square and it's still looks the same rotate a trap and you can tell it's on its side
90 degrees
Yes
A square.
It is 180 degrees.
A trapezoid
60 degrees
Rotate 360 degrees
square. rotate a square and it's still looks the same rotate a trap and you can tell it's on its side
With 4 equally spaced blades on a fan, you can rotate the fan onto itself with a minimum of 90 degrees. Each blade will align with the next blade at a quarter turn, which corresponds to 90 degrees.
90 degrees
90 degrees
90 degrees
Yes. A square needs only a quarter rotation.