if you mean diagonals i don't know maybe 9
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A nine sided shape has 7 triangles
A 7 sided heptagon contains 5 triangles.
There are 900 degrees in a seven sided figure!!
A seven sided figure is called a heptagon.
None!!!! A 7-sided polygon is named 'HEPTAGON'., However, An 8-sided polygon is named 'OCTAGON'.