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d=a√2
a) d=5cm 5=a√2 /:√2
5√2÷2=a
a÷d=5√2÷10
a÷d=√2÷2
b)d=2,8 2,8=a√2
a=2,8√2÷2
a÷d=2,8√2÷5,6
a÷d=√2÷2
c)d=2√3 2√3=a√2
a=√6
a÷d=√2÷2