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½d=4dm→d=8dm
d=a√2
8=a√2
a=8√2:2=4√2
odp. bok kwadratu ma 4√2dm, co = około 4×1,41=5,64dm
d=2r
d=8dm
d=a√2 /√2
d÷√2=a
a=8÷√2dm
@2up po co dzielisz jeszcze raz przez 2?
p=2r
p=2*4dm=8dm
p=a√2
gdzie a - bok kwadratu
a=p/√2=8/√2=8√2/(√2*√2)=8√2/2=4√2