przekatna kwadratu jest o 3 cm dłóższa od jego boku. oblicz p tego kwadratu.
a√2-a=3
a(√2-1)=3
a=3/√2-1
a=3(√2+1)/(√2-1)·(√2+1)
a=3√2+3
P=aa
P=(3√2+3)·(3√2+3)
P=18+9+18√2
P=27+18√2
P=9(3+2√2) (cm²)
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a√2-a=3
a(√2-1)=3
a=3/√2-1
a=3(√2+1)/(√2-1)·(√2+1)
a=3√2+3
P=aa
P=(3√2+3)·(3√2+3)
P=18+9+18√2
P=27+18√2
P=9(3+2√2) (cm²)