Zero
It doesn't need any in order to be a trapezoid. It can have a max of two pairs of perpendicular sides.
Zero
None but it has end sides of equal lengths
A trapezoid has one pair of parallel sides, which are its bases. The other two sides, called the legs, are not parallel and can be either perpendicular or slanted, depending on the specific type of trapezoid. In summary, a trapezoid has one pair of parallel lines and zero perpendicular lines by definition.
yes
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, an isosceles trapezoid is one example.
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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.
trapezoid
right triangle