10
Nodes A B C D E
A-B B-C C-D D-E A-C A-D E-B E-C E-A B-D
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draw lines and connect them
Contour lines connect points of equal elevation while isobars connect points of equal pressure
One, if they're in a row.
A cylinder has an infinite number of lines of symmetry (because a circle has an infinite number of lines of symmetry).
Number of lines of symmetry = Number of sides of the regular polygon