A quadrilateral with one pair of parallel lines would be a trapezoid. : P
trapezium
TRAPEZOID
There can be only one pair of perpendicular lines in an isosceles triangle when it is a right angled isosceles triangle. A non right angled isosceles triangle has no pairs of perpendicular lines.
A right angle trapezoid
It could be a kite or an irregular quadrilateral.
A right trapezoid has exactly one pair of perpendicular lines and is a quadrilateral.
One pair of perpendicular lines would create one right angle. Some kites have one right angle.
To prove that a quadrilateral is a right trapezoid, you need to show that it has one pair of parallel sides and one pair of right angles. This can be done by using the properties of parallel lines and perpendicular lines.
A quadrilateral with one pair of parallel lines would be a trapezoid. : P
trapezium
Only one pair: trapezium.
TRAPEZOID
A quadrilateral with only one pair of parallel lines is called a trapezoid.
trapezoid
A trapezoid
I think it is either a right triangle, square, pentagon, or rectangle.