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An octagon has 8 sides and 20 diagonals so the question doesn't make sense

Q: How many side does a octagon with 35 diagonals have?

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It has 0.5*(35^2 -3*35) = 560 diagonals

35 diagonals

35

It has 10 sides because using the formula 0.5*(102-30) = 35 diagonals

A 35-gon has 560 diagonals 0.5*(352-3*35) = 560

Related questions

octagon

There are 560 diagonals by using the diagonal formula

It has 0.5*(35^2 -3*35) = 560 diagonals

There are 35 diagonals in a 10 sided decagon

It has 35 diagonals

35 diagonals

(35*(35-3))/2 (35*32)/2 1120/2 560 diagonals

35.

35

35

35 diagonals

The number of diagonals is n(n-1)/2 - n substitute n=35 35(34)/2 - 35 = 560