True
If you are talking about the diagonals of a quadrilateral, the only quadrilateral that have diagonals that are perpendicular and bisect each other is a square, because a rectangle has bisecting diagonals, while a rhombus has perpendicular diagonals. And a square fits in both of these categories.
diagonals.
may or may not be
trapezoid
always
Square
True
True
true
The missing word is "bisect".
If you are talking about the diagonals of a quadrilateral, the only quadrilateral that have diagonals that are perpendicular and bisect each other is a square, because a rectangle has bisecting diagonals, while a rhombus has perpendicular diagonals. And a square fits in both of these categories.
diagonals.
Square, Rhombus
True
may or may not be
A quadrilateral is a parallelogram if and only if its diagonals bisect each other (this should be in any geometry book)