Are the diagonals of a square equal?

In which of the following quadrilaterals are the four sides equal?

square, rectangle, parallelogram, rhombus, trapezium

Which of the following quadrilaterals are not parallelograms?

square, rectangle, rhombus, trapezium

Which of the following quadrilaterals have equal diagonals?

paralelogram, square, rectangle, rhombus, trapezium

Name two quadrilaterals whose diagonals bisect each other at right angles.

If in a trapezium, non-parallel sides are equal, then it is called _____ trapezium.