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It can be but a square and a rhombus diagonals are also perpendicular and therefore intersect at 90 degrees and they too are both quadrilaterals.

Q: If a quadrilateral has the property that the diagonals are perpendicular and at least one of them is then the quadrilateral is a kite?

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Yes

Every closed figure with at least 4 sides has at least 2 diagonals. Every quadrilateral (figure with exactly 4 sides) has exactly 2 diagonals. That includes all parallelograms, rhombera, rectangles, squares, trapezoids, diamonds, and kites, as well as all other irregular quadrilaterals.

No. Even in the non-US use of the term (a quadrilateral with at least one set of parallel lines), the lengths of the parallel lines may not be the same, and/or the angles formed by each adjacent side may be different (as in a rhomboid), resulting in diagonals of extremely different lengths.Only in rectangles are diagonals "always" of equal length.

Yes, at least one

No.

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Two.

Yes

Every closed figure with at least 4 sides has at least 2 diagonals. Every quadrilateral (figure with exactly 4 sides) has exactly 2 diagonals. That includes all parallelograms, rhombera, rectangles, squares, trapezoids, diamonds, and kites, as well as all other irregular quadrilaterals.

No. Even in the non-US use of the term (a quadrilateral with at least one set of parallel lines), the lengths of the parallel lines may not be the same, and/or the angles formed by each adjacent side may be different (as in a rhomboid), resulting in diagonals of extremely different lengths.Only in rectangles are diagonals "always" of equal length.

Any quadrilateral in which at least one (and therefore at least two) angles are not right angles is not a rectangle. The majority of these do not have a specific name.

It is a 4 sided quadrilateral It has 4 interior right angles It has 2 diagonals Its opposite side are parallel It has length and width of different dimensions It will tessellate It has a perimeter which is the sum of its 4 sides It has an area which is length times width

I suppose. All of a square's sides are perpendicular.

No.

You can divide a quadrilateral up into as many triangles as you want, but at least two.

Perpendicular lines intersect at one point only.

No.

Yes, at least one