d=a√2 12=a√2 144=a^2*2 a^2=72 a=6√2
esli kvatrat to d^2=a^2+a^2 gde d esti diagonala a a esti storoni kvadrata
d=12cm
togda reshaem po teoreme pifagora
12^2=a^2+a^2
144=2a^2
a^2=144/2
a^2=72
a=sqrt(72)
a=6sqrt(2)
