Exploring Points, Lines, and Planes (V1)

In the app below, drag the points to move the POINT, LINE, and PLANE. [br][br][i]If you click on a point before dragging it, you can change the direction to where you want to move it. [/i]
Without Googling, how would you describe the term "POINT"?
Without Googling, how would you describe the term "LINE"?
Without Googling, how would you describe the term "PLANE"?
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Information: Exploring Points, Lines, and Planes (V1)