A regular quadrilateral is a square. As to the measure, the answer depends on the measure of WHAT? An angle, a side, the diagonal, area, perimeter, etc.
A quadrilateral in which diagonal are not congruent and only larger diagonal is perpendicular bisector of smaller diagonal then it is known as kite -- Mohan S. Vighe
Any quadrilateral that is not a parallelogram can have only one diagonal that is bisected by the other.
No. It could be a kite.
Two of them
In this case, the quadrilateral is sometimes a parallelogram.
If those are four sides of a quadrilateral, you would also need some additional information, for example some angle, or a diagonal. If you have a diagonal, you can separate your quadrilateral into two triangles, and use Heron's formula.
a quadrilateral in which diagonal are not congruent and larger diagonal is perpendicular bisector of smaller diagonal then it is known as kite
isn't it a rhombus ? the ones that are like a slanted square ? because there are no right angles but each diagonal bisects the corners.