Points are connected .

 

  Move one of the triangle's vertices by dragging with the right mouse button. (Notice the mouse cursor changes from an "arrow" to a "hand" when it is in position to move the point. Do not start dragging until the cursor changes to a "hand".)

The sides of the triangle move with the vertex, as expected.

  To return to the original triangle,  use the "Reload" button in your browser.

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