A nonagon
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A nine sided plane figure is a nonagon. A nine sided three dimensional figure is a nonahedron.
Assuming the numbers are in metres! 25 × 9 = 225 square metres.
Any two figures that total 17 ie from 1 x 16 up to 8 x 9
Three of them which are 9, 0 and 9
An infinite amount. It starts: Point Line Triangle - 3 sides Square - 4 sides Pentagon - 5 sides Hexagon - 6 sides Heptagon - 7 sides Octagon - 8 sides Nonagon - 9 sides Decagon - 10 sides Hendacagon -11 sides Dodecagon - 12 sides .... Hectogon - 100 sides .... Chiliagon - 1,000 sides .... Myriagon - 10,000 sides .... Hecatommyriagon - 1,000,000 sides The list never ends.