22-gon
It is an undecagon which has 11 sides Check: 0.5*(112-33) = 44 diagonals
There are 90 diagonals in a 15-sided polygon.
It has 40 diagonals.Improved Answer:-Using the formula for diagonals of a polygon: 0.5*(442-132) = 902 diagonals
It is: 0.5*(n2-3n) = diagonals whereas n is the number of sides of the polygon
22-gon
209
There is no such polygon that has 95 diagonals because a 15 sided polygon has 90 diagonals and a 16 sided polygon has 104 diagonals.
quadrilateral
A pentagon.
A polygon that has 104 diagonals will have 16 sides
That polygon is called a "triangle". It has no diagonals.
It is an undecagon which has 11 sides Check: 0.5*(112-33) = 44 diagonals
It is a dodecagon which has 12 sides Check: 0.5*(144-36) = 54 diagonals
pentagon
There are 90 diagonals in a 15-sided polygon.
An 11 sided polygon has 44 diagonals.