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d=10 - przekątna
Obliczam a
Obliczam pole
Obliczam obwód
bok kwadratu =a
z pitagorasa
a²+a²=d²
2a²=10²
2a²=100 /:2
a²=50
a=√50=5√2
P=a²=(5√2)²=50 [j²]
O=4a=4·5√2=20√2