By tridecagon, I suppose you are referring to a 13 sided shape. In any shape, you could draw however many triangles you wanted to. If you are after triangles formed by a line from the corners of the shape to the centre, a tridecagon (after the first few shapes, mathematicians usually just use the term n-gon so your 13 sided shape would be called a 13-gon), would contain 13 triangles formed in this way.
A tridecagon is a 13 sided polygon. Also called a triskaidecagon.
tridecagon
Tridecagon
henagon, digon, triangle, quadrilateral, pentagon, hexagon, heptagon, octagon, nonagon, decagon, hendecagon, dodecagon, tridecagon, tetradecagon, pentadecagon, hexadecagon, heptadecagon, octadecagon, nonadecagon, icosagon
tridecagon (or triskaidecagon)
A triangle has no diagonals
A tridecagon has 13 sides and can be divided into triangles by drawing diagonals from one vertex to all other non-adjacent vertices. This results in exactly 11 triangles, as each vertex connects to 10 other vertices, but each triangle shares sides with others. Therefore, the number of triangles that can be formed within a tridecagon is 11.
A tridecagon has 13 angles
A tridecagon is a 13 sided polygon. Also called a triskaidecagon.
triskaidecagon or a tridecagon. triskaidecagon or a tridecagon.
3 triangle, trigon 12 dodecagon, duodecagon 13 triskaidecagon, tridecagon 14 tetrakaidecagon, tetradecagon 15 pentadecagon
A Monster from Another Universe! You are invited to consider the meaning of the word "triangle". Possibly you're thinking of a triskaidecagon, or tridecagon, which I found in Wikipedia searching "polygon 13 sides." Why bother searching when there are people like me to do it for you?
A 13 sided polygon is called a Tridecagon also a Triskaidecagon.
A link to a picture of a regular tridecagon (also known as a triskaidecagon), a thirteen-sided polygon, can be found below this answer.
Triskaidecagon or Tridecagon
tridecagon
tridecagon i thinkk??