Calculate, correct to one decimal place, the length of th...
Calculate, correct to one decimal place, the length of the line joining points X(3, 5) and Y(5, 1).
4.0
4.2
4.5
5.0
Correct answer is C
\(XY = \sqrt{(x_{1} - x_{2})^{2} + (y_{1} - y_{2})^{2}}\) is the distance between a point \(X(x_{1}, y_{1})\) and \(Y(x_{2}, y_{2})\).
\(XY = \sqrt{(3 - 5)^{2} + (5 - 1)^{2}} = \sqrt{20}\)
= \(2\sqrt{5} = 4. 467 \approxeq 4.5\)
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