Odpowiedź:
Obwód = 1bok + 2bok + 3bok
1bok = 4cm
2bok = x/3
3bok = x
Z twierdzenia pitagorasa obliczamy x
4^2 + x^2/9 = x^2
16 + x^2/9 = x^2 /*9
144 + x^2 = 9x^2
144 = 8x^2 /:8
18 = x^2
x = √18 = 3√2
Obwód = 4 + x/3 + x = 4 + √2 + 3√2 = 4 + 4√2
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Odpowiedź:
Obwód = 1bok + 2bok + 3bok
1bok = 4cm
2bok = x/3
3bok = x
Z twierdzenia pitagorasa obliczamy x
4^2 + x^2/9 = x^2
16 + x^2/9 = x^2 /*9
144 + x^2 = 9x^2
144 = 8x^2 /:8
18 = x^2
x = √18 = 3√2
Obwód = 4 + x/3 + x = 4 + √2 + 3√2 = 4 + 4√2