In a square, the diagonals are:

In a square, the diagonals are:
  1. Equal but not perpendicular
  2. Perpendicular but not equal
  3. Equal and bisect each other at right angles
  4. Neither equal nor perpendicular

Solution

A square is both a rectangle and a rhombus, so its diagonals are equal (rectangle property), bisect each other (parallelogram property) and are perpendicular (rhombus property).

Asked in: IMO

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