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Q: How do you work out how many regions there are in a shape after you have done the diagonals?

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35 diagonals

There are 54 diagonals in a 12 sided shape

I am sure that a shape with six side has 9 diagonals. (I found out cause I really wanted to help people.)

A nanogon has no diagonals because there is no such shape. A nonagon, on the other hand, has 9*(9-3)/2 = 27 diagonals.

Depends on the shape.

Related questions

35 diagonals

There are 54 diagonals in a 12 sided shape

There are: 0.5*(10002-3000) = 498,500 diagonals

it's a 12 sided shape and it has 54 diagonals :D

There are 275 diagonals in a shape with 25 sides. The formula is n*(n-3)/2

1/2*(1002-300) = 4850 diagonals

8

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

I am sure that a shape with six side has 9 diagonals. (I found out cause I really wanted to help people.)

A nanogon has no diagonals because there is no such shape. A nonagon, on the other hand, has 9*(9-3)/2 = 27 diagonals.

corn dogs

Depends on the shape.