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e = 2f
25 = 2f * f :2
25 = f *f
f = 5
e =10
p=e*f/2
czyli:
25cm²=e*f/2
f
e=2f
podstawiam:
25cm²=2f*f/2
25cm²=f*f
f=5cm
skoro e=2f=10cm
f=5sm
e=10cm
:)