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# Its diagnols intersect at right angles.
 
# Its diagnols intersect at right angles.
 
# The sum of its four sides would be its perimetre.
 
# The sum of its four sides would be its perimetre.
# Its area is given by the formula <math>(1/2) (product of its diagnols)</math>
+
# Its area is given by the formula <math>(1/2) (product   of   its   diagnols)</math>
    
===Notes for teachers===
 
===Notes for teachers===
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