Perpendicular would be at a right angle. If your sides are abcd, then ab, bc, cd, and da are perpendicular pairs.
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How many pairs of perpendicular sides does this figure have?
It doesn't need any in order to be a trapezoid. It can have a max of two pairs of perpendicular sides.
Perpendicular means meeting at a right angle. A right triangle has 2 sides that are perpendicular, so it has 1 pair of sides that are perpendicular They are known as the "legs" of the right triangle.
A square has four parallel sides (two pairs of parallel sides).
Six. If the sides are labelled a, b, c and d then the congruent pairs are: ab, ac, ad, bc, bd and cd