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przekątna kwadratu: a√2
róznica: a√2-a=3cm <=> a(√2-1)=3cm <=> a=3/(√2-1)
Pole: P=a² <=> P=(3/(√2-1))² <=> P=9/(2-2√2-1) <=> P=9/(1-2√2)cm²
Obwód: O=4a <=> O=12/(√2-1)cm
a - bok
d - przekątna
d = a√2
d - a = 3
a√2 - a = 3
a(√2-1) = 3 | ÷(√2-1)
a = 3÷(√2-1) | usuwamy nie wymierność
a = 3×(√2+1)÷(√2-1)(√2+1)
a = (3√2+3)÷(2-1)
a = 3√2+3
P = a²
P = (3√2+3)²
P = 18 +18√2 +9 = 18√2 + 27
P = 9(2√2 + 3)
L = 4a
L = 4×(3√2+3)
L = 12(√2+1)