It doesn't need any in order to be a trapezoid. It can have a max of two pairs of perpendicular sides.
The only requirement for a trapezoid is that one pair of opposite sides be parallel. There could be trapezoids with a pair of perpendicular lines.
xfchfh
A right trapezoid has exactly one pair of perpendicular lines and is a quadrilateral.
trapezoid rhombus parellogrm
This is a trapezoid (or trapezum, depending on what country you live in).
Zero
Zero
None but it has end sides of equal lengths
The only requirement for a trapezoid is that one pair of opposite sides be parallel. There could be trapezoids with a pair of perpendicular lines.
yes
Yes, an isosceles trapezoid is one example.
xfchfh
To calculate the area of a trapezoid, you have to know the lengths of three sides because 1/2*(sum of parallel sides)*perpendicular height = area
A right trapezoid has exactly one pair of perpendicular lines and is a quadrilateral.
right triangle
trapezoid
trapezoid rhombus parellogrm