问题
解答题
一辆汽车以16千米/时的速度离开甲城市，向东南方向行驶，另一辆汽车在同时同地以12千米/时的速度离开甲城市，向西南方向行驶，它们离开城市3个小时后相距多远？
答案
如图所示：
由题意得，OA=12×3=36km，OB=16×3=48km．
在直角△OAB中，AB=
=60km．OA2+OB2
答：它们离开甲城市3个小时后相距60km．
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一辆汽车以16千米/时的速度离开甲城市，向东南方向行驶，另一辆汽车在同时同地以12千米/时的速度离开甲城市，向西南方向行驶，它们离开城市3个小时后相距多远？
如图所示：
由题意得，OA=12×3=36km，OB=16×3=48km．
在直角△OAB中，AB=
=60km．OA2+OB2
答：它们离开甲城市3个小时后相距60km．
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