A trapezoid is a shape of plane geometry. It’s a quadrilateral, where at least two sides are parallel.
If a trapezoid has two pairs of parallel sides, it’s also called a parallelogram.
An isosceles trapezoid is a trapezoid, where two sides are parallel, and the two other sides are of equal length.
For a isosceles trapezoid with the angles A,B,C and D applies that
A = B and C = D
A trapezoid with at least two right angles is called a right trapezoid.
The number of right angles can never be three.