At each corner and at 90 degrees which is a right angle
Where the diagonals meet. Also where the perpendicular bisectors of the sides meet.
Yes and they meet at right angles which is 90 degrees
Not always as for example the perpendicular lines of a square meet each other at right angles.
No, a square has four perpendicular sides.
A square or a rectangle has perpendicular sides that meet each other at right angles which is 90 degrees.
A square and a rectangle will meet the given criteria.
It has 4 and they all meet at right angles which is 90 degrees
The adjacent sides of a square are perpendicular.
I suppose. All of a square's sides are perpendicular.
Yes a square has 2 pairs of perpendicular sides actually, 4!
A rhombic octagon. An ordinary regular octagon does have perpendicular sides. They do not meet in the outline of the octagon because they are alternate, but they are still perpendicular. However, in the same way that a rhombus is a distorted square, a rhombic octagon can have 4 pairs of parallel sides but no perpendicular ones.
Not normally but as a rectangle it has perpendicular sides that meet at right angles