A 28 sided polygon is called an Icosikaioctagon This link should help: http://www.math.com/tables/geometry/polygons.htm
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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.
An irregular pentagon.