You may be thinking of a heptagon. It has seven sides and seven angles.
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A 11 sided shape is called a hendecagon.
The word is heptagon. A heptagon has 7 sides and 7 corners. If you join corners by straight lines from one corner to another corner you will find 5 triangles, but if you join all corners to a point in the centre you will find 7 triangles. The Heptathlon in athletics is a contest in which the participants must compete in 7 different athletic forms of athletics.
10 sides.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
heptagons have 7 sides