Question 558833
the diagonal of square bisects the square

the diagonal is the hypotenuse of triangle with the sides as leg1 & leg2

Hypotenuse ^2= leg1^2+leg2^2					
					
leg1 = 	12	cm			
Leg2^2=	12	cm			
					
Hypotenuse^2	12	^2	+	12	^2
Hypotenuse^2	144	+	144		
Hypotenuse^2	288				
take the square root					
Hypotenuse=	16.97	cm			
=17 

Perimeter = 17+12+12= 41 cm