A regular pentagon has zero perpendicular sides. If it is irregular, it could have as many as 2 or 4 perpendicular sides.
2, the two smallest sides are perpendicular to eachother.
A right angle has one pair of perpendicular sides.
A rectangle has 4 perpendicular sides that meet each other at right angles.
100
A regular pentagon has zero perpendicular sides. If it is irregular, it could have as many as 2 or 4 perpendicular sides.
An equilateral triangle doesn't have any perpendicular sides on it.
A rhombus has no perpendicular sides but its diagonals are perpendicular to each other and meet at right angles.
2, the two smallest sides are perpendicular to eachother.
A right angle has one pair of perpendicular sides.
Perpendicular would be at a right angle. If your sides are abcd, then ab, bc, cd, and da are perpendicular pairs.
It doesn't need any in order to be a trapezoid. It can have a max of two pairs of perpendicular sides.
A rectangle has 4 perpendicular sides that meet each other at right angles.
none
Four
Zero
100