What are quadrilaterals with the same diagonal length

Question

I'm not sure what the answer is. I am staying and need to know 

Answer 1

Quadrilaterals with congruent diagonals:

  

   1. Square

   2. Rectangle

   3. Isosceles Trapezoid

Answer 2

All parallelograms including rectangle, square, rhombus have diagonals of equal length and they bisect each other.

Answer 3

Hi Ajay,

 

Quadrilaterals with the same diagonal length are rectangles or squares.  Remember that a square is a special case of a rectangle.