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On the right screen (board 2) a parallel-hexagon is shown - a hexagon with opposite sides parallel. Drag any of the red vertices to see how it changes.
Construction challenge: Under the menu Objects/Lines select Line Segment, Parallel line, etc. to construct your own parallel-hexagon on the left screen.
Measure all the angles. (Under the menu Objects/Lines select Measure angle, and select the 3 vertices in order that determine an angle). What do you notice about the angles of a parallel-hexagon? Check by dragging. Can you explain (prove) why its true? Go to Parallel-Hexagon for a hint, if necessary.