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参考・概略です

AB間の距離の計算
√[{(Bのx座標)-(Aのx座標)}²+{(Bのy座標)-(Aのy座標)}²]

(1) √[{(8)-(2)}²+{(9)-(1)}²]
 =√[{6}²+{8}²]
 =√[36+64]
 =√[100]
 =10

(2) √[{(4)-(-1)}²+{(-5)-(7)}²]
 =√[{5}²+{-12}²]
 =√[25+144]
 =
 =

(3) √[{(4)-(-4)}²+{(2)-(6)}²]
 =√[{8}²+{-4}²]
 =
 =
 =

(4) √[{(3)-(0)}²+{(5)-(0)}²]
 =
 =
 =

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