Rectangles and squares.
No you can have up to four, but that's it.
No, a quadrilateral does not necessarily have any right angles. If it has a right angle, it will necessarily have four right angles, and will be a rectangle. But not all quadrilaterals are rectangles. As long as a polygon has four sides, it is a quadrilateral. It might have, for example, two angles of 100o and two angles of 80o.
a rectangle
A rectangle is classed as a 4 sided quadrilateral in math.
Rectangle.
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A right trapezium or an irregular quadrilateral.
A rectangle is actually a parallelogram, or a quadrilateral with two pairs of parallel sides. The thing about a rectangle is that it not only has two parallel sides, it has four right angles. Therefore, the answer to your question is: A rectangle is a parallelogram with four right angles.
If you are saying a quadrilateral that only has two right angles I believe it is a trapezoid. A square or other rectangle, all of which have four right angles, also satisfies all the conditions explicitly given.
A quadrilateral has four interior angles. It may have two, three, four, or none of them congruent.
Two pairs of equal sides and four right angles.
a square