What is a quadrilateral with one right angle?

A quadrilateral with one right angle is simply a right-angled quadrilateral. This type of quadrilateral can have various shapes, but the key feature is that one of its four angles measures 90 degrees.

Here are some common types of quadrilaterals with one right angle:

Right-angled trapezium: A quadrilateral with one pair of opposite sides parallel and one of the angles being 90 degrees.
Right-angled kite: A quadrilateral with two pairs of adjacent sides that are equal in length and one of the angles is 90 degrees.
Right-angled parallelogram: A quadrilateral with opposite sides parallel and equal in length, and one of the angles being 90 degrees. This is also a rectangle.
In general, any quadrilateral can have one right angle, but the exact properties depend on the other angles and side lengths.