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obw=4a
60=4a |:4
a=15
s i f przekątne f=2k np
s=10
p=1/2*s*f
a²=(1/2s)²+(k)²
15²=5²+(k)²
225-25=k²
200=k²
k=√200
k=√2*100
k=10√2cm
f=20√2
p=1/2*10*20√2
p=100√2cm²