square
a square
Yes, the diagonals of a square are congruent (equal in length) and are perpendicular.
A square.
All but the square and rectangle.
If they are being drawn from the corners of the square, they should be equal.
A rectangle, a square, and an isosceles trapezoid.
A rectangle, square or isosceles trapezium.
An isosceles trapezoid will have diagonals of equal length but will never contain right angles by definition. A square and rectangle will have diagonals of equal length but will contain 4 right angles. A rhombus and any other parallelogram that does not contain right angles will not have diagonals of equal length.
Regular polygons. A square and rectangle will have congruent (equal length) diagonals.
A square has 2 diagonals that are equal in length and bisect each other at right angles.
They are equal in length and bisect each other at 90 degrees