Quadrilateral means four sides.
Four right angles and four sides is a rectangle and if the sides are equal length it is a square.
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A quadrilateral can have two right angles and still not be a rectangle, if one side is oblique (neither right nor parallel) to the others, but three right angles force the fourth, and you have a rectangle.
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No, the circle is inscribed in the quadrilateral.
NO. A trapezoid cannot be a rectangle. If a parallelogram has one right angle then it is a rectangle. A trapezoid doesn't satisfy this condition because a trapezoid is a quadrilateral with exactly one parallel side which means that it doesn't have a right angle.
The side opposite the right angle in a right angle triangle is its hypotenuse