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Obw=6a
Obw=6*4cm
Obw=24cm
2.
d=a√2
½d=8cm
d=16cm
16cm=a√2/:√2
a=16cm:√2
a=8√2cm
Obw=4a
Obw=4*8√2cm
Obw=32√2cm
3.
h=⅔*a√3:2
h=2cm
2cm=⅔*a√3:2/*2
⅔*a√3=4cm/*3
2a√3=12cm/:2√3
a=24√3cm:12
a=2√3cm
Obw=3a
Obw=3*2√3cm
Obw=6√3cm
liczę na naj ;P