88. Izračunajte razdaljo med točkama \( A(3,-2) \) in \( B(-1,-4) \). Zapišite koordinati razpolovišča \( R \) daljice \( A B \).
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Razdaljo med točkama \( A(3,-2) \) in \( B(-1,-4) \) izračunamo s formulo za razdaljo med dvema točkama v ravnini: \[ d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} = \sqrt{((-1) - 3)^2 + ((-4) - (-2))^2} = \sqrt{(-4)^2 + (-2)^2} = \sqrt{16 + 4} = \sqrt{20} = 2\sqrt{5} \approx 4,47. \] Koordinate razpolovišča \( R \) daljice \( AB \) dobimo s povprečenjem koordinat obeh točk: \[ R \left( \frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2} \right) = R \left( \frac{3 + (-1)}{2}, \frac{-2 + (-4)}{2} \right) = R \left( \frac{2}{2}, \frac{-6}{2} \right) = R(1, -3). \]