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
A polygon with 9 sides and 9 vertices is a nonagon