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.
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You may be thinking of a heptagon. It has seven sides and seven angles.
no triangles
There are no triangles.
it has 13 triangles
There are 5 triangles in a heptagon