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How many diagonals does an octadecagon have?

Updated: 4/28/2022

Wiki User

∙ 13y ago

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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.

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Q: How many diagonals does an octadecagon have?

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Continue Learning about Other Math

How many sides does an octadecagon have?

An octadecagon, also called an octakaidecagon, has 18 sides, from the Greek octa-, signifying 8, the connector -kai-, and deca- signifying 10.

How many diagonals does a undecagon have?

A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.

How many diagonals does a quadrilateral?

2 diagonals

How many diagonals does a square have?

It has 2 Diagonals!!!

How many diagonals has a nonagon have?

It has 27 diagonals

Related questions

What regular polygon has 9 diagonals?

A regular octadecagon (an eighteen sided polygon) would have nine diagonals.

How many faces does a octadecagon?

An octadecagon is an 18 sided polygon.

How many vertices does a octadecagon have?

It has 18

How many sides does an octadecagon have?

An octadecagon, also called an octakaidecagon, has 18 sides, from the Greek octa-, signifying 8, the connector -kai-, and deca- signifying 10.

How many diagonals does triacontakaihexagon has?

It has 1,345,890 diagonals

How many diagonals does a undecagon have?

A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.

How many diagonals in nonagon?

24 diagonals

How many diagonals does a quadrilateral?

2 diagonals

How many diagonals does a square have?

It has 2 Diagonals!!!

How many diagonals are in a octagon?

There are 20 diagonals

How many diagonals do octagons have?

20 diagonals

How many diagonals has a nonagon have?

It has 27 diagonals

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How many diagonals does an octadecagon have?

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