**rectangular trapezoid**(also called right-angled trapezoid, right trapezoid) has such kind:

Rectangular trapezoid |

A

**rectangular trapezoid**always has two right angles. On a picture direct corners are marked little squares in tops

**A**and

**D**. Direct corners can be situated in two any contiguous tops of trapezoid.

Rectangular trapezoid |

On this picture of rectangular trapezoid direct corners are located in tops

**B**and

**С**.

In mathematics there is

**determination of rectangular trapezoid**, which over is brought and in Wikipedia:

**the rectangular is name a trapezoid at which even one corner of line**. This classic determination of rectangular trapezoid, bluntly rewritten from sacred mathematical books. In Euclidean geometry a rectangular trapezoid always has two lines of corner, as two sides trapezoids, called grounds, are parallel. Segment

**BC**, formative a direct corner with founding of

**АВ**, will be always perpendicular to the second founding of

**CD**. With one or three direct corners there can be only a curvilinear rectangular trapezoid, and it is quite another other class of geometrical figures already.

For blondes helped to draw

**kria**, author of blog kria-tiv.

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