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1) Calcule a distância entre os pontos A(2, 1) e B(4, -1) . *1 ponto A) 2√2 B) √2 C) √15 D) 10 E) n.D.A F) Outro: 2) Sejam os pontos A(x, 2) e B(0, 1). Determine o valor de x no ponto A, sabendo que a distância entre A e B é 5. * 1 ponto A) √26 B) 2√6 C) 5 D) 4 E) n.D.A 3) Calcule a distância aproximada entre os pontos A e B, sabendo que suas coordenadas são A (2,5) e B (– 5, – 2). * 1 ponto A) 200 B) 150 C) 100 D) 80 E) 70

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Answer and Step-by-step explanation: The distance between 2 points is the distance of the straight line that passes through both points. It calculated using the following formula:

d =
\sqrt{(x_(B) - x_(A) )^(2) + (y_(B) - y_(A) )^(2) }

1) For A (2,1) and B(4, -1)

d =
\sqrt{(4-2)^(2) + (1+1)^(2) }

d =
√(4+4)

d = 2
√(2)

2) 5 =
\sqrt{(0-x)^(2) + (1-2)^(2) }

25 = x² + 1

x² = 24

x = 2
√(6)

3) d =
\sqrt{(-5-2)^(2) + (-2-5)^(2) }

d =
\sqrt{(-7)^(2) + (-7)^(2) }

d = 7
√(2)

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