Normally 4 sides as in a square or a rectangle
A square or a rectangle.
A regular polygon with 4 sides is a square. The measure of any interior angle of a square is 90 degrees.
A square.
Perpendicular would be at a right angle. If your sides are abcd, then ab, bc, cd, and da are perpendicular pairs.
square
Normally 4 sides as in a square or a rectangle
It is: 360/90 = 4 sides and it is a square
one angle
A square and a rectangle.
An angle must have 2 sides or it is no longer an angle.
...the remaining two sides?
A square has 4 vertices. A vertex is the point at which the sides of an angle intersect. There are four corners or angle intersections for a square.
a square
Square
square
A square or a rectangle.