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Number of diagonals = 18*(18-3)/2 = 135

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Q: How many diagonals are there in a 18 sided shape?
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How many diagonals can be drawn from any vertex of a 20-sided polygon?

It is 18 diagonals


How many diagonals does an octadecagon have?

The formula for the number of diagonals (that is, lines joining non-adjacent vertices) belonging to any shape is n(n-3)/2. Therefore, an eighteen-sided polygon has 18 x (18 - 3)/2 = 135 diagonals.


How many sides does a 18 sided regular polygon have?

If you say this shape is 18 sided i would guess it has 18 sides. ;)


What is the special features of the dodecahedron?

It is a 3-dimensional simply connected shape with 12 polygonal faces. That is it! It can have as few as 8 or as many as 20 faces, as few as 18 or as many as 30 edges, the faces can all be triangles or the shape can have an endecagonal (11-sided) face. It can have between 9 and 170 diagonals.


What is the name off an 18 sided shape?

All I can tell you is that a 16 sided shape is called a Hexadecagon


What do you call a 18 sided shape?

Well, darling, an 18-sided shape is called an octadecagon. It's a mouthful to say, but hey, at least now you can impress your friends with your geometry knowledge. Just don't ask me to draw one, honey, I'm not an artist.


What is the name of an 18 sided 3d shape?

no


A 18 sided 2D shape?

Tetrahaidecahedron


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octadecagon


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enneadecagon or enneakaidecagon


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How many diagonals can you draw in a polygon with 18 side?

153 diagonals.