A 28 sided polygon is called an Icosikaioctagon This link should help: http://www.math.com/tables/geometry/polygons.htm
Each angle in a 28-sided shape is about 167.14 degrees.
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If it's a regular 28-agon then each interior angle is: (26*180)/28 = 167.'142857' degrees recurring decimals 0.'142857'
Square
A regular 12-sided polygon is called a dodecagon - from the Greek dodeka, meaning 12, and gonus, meaning angle.
Each angle in a 28-sided shape is about 167.14 degrees.
12.4567890
angle
angle
Providing that it is a regular 28 sided polgon then each interior angle will measure: 1670 8' 34.29''
The name of the angle which has three sided polygon called Triangle.
icosikaioctagon
If it's a regular 28-agon then each interior angle is: (26*180)/28 = 167.'142857' degrees recurring decimals 0.'142857'
Square
A regular 12-sided polygon is called a dodecagon - from the Greek dodeka, meaning 12, and gonus, meaning angle.
An irregular pentagon.
The interior angles add up to 4680 degrees