How many perpendicular sides does a hexagon have?

Answer 1

Hexagons come in many different shapes and sizes. As long as the figure has 6 straight edges and 6 angles, (with closed figure, of course) it's a hexagon. A regular hexagon though, has no perpendicular sides.
A regular 6 sided hexagon has no perpendicular lines but it does have 3 pairs of parallel lines.

Answer 2

There can be 5 but there need not be any.