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Trapezoid

An ordinary trapezoid
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.

Isosceles trapezoid

An isosceles trapezoid with axis of symmetry
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

Right trapezoid

A right angled trapezoid
A trapezoid with at least two right angles is called a right trapezoid.

The number of right angles can never be three.