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Earn +20 ptsQ: How many diagonals are there in a 18 sided shape?
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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.
What is the name off an 18 sided shape?
All I can tell you is that a 16 sided shape is called a Hexadecagon
A 18 sided 2D shape?
Tetrahaidecahedron
What is a 18 sided 3D shape called?
Octadecadron
What a 18 sided shape is called?
If it is a 2 dimentional shape it is called an 'octadecagon'
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