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垂直

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A diagram showing vertical and horizontal lines

垂直と水平の科学的定義重力と地球の曲率がもたらす視点

垂直水平重力方向地球の曲率
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The segment AB is perpendicular to the segment CD because the two angles it creates (indicated in orange and blue) are each 90 degrees. The segment AB can be called the perpendicular from A to the segment CD, using "perpendicular" as a noun. The point B is called the foot of the perpendicular from A to segment CD, or simply, the foot of A on CD.[1]

幾何学における垂直の概念と性質基礎から応用まで

幾何学垂直直交直角
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