It All depends how big it is
152.307692 repeating degrees
The exterior angles of any polygon add up to 360. 360/15 = 24
30 degrees
It is a polygon (a shape with more than 3 sides) where all of it's lengths are the same, and all of its angles are the same size.
A three sided polygon in which two sides are equal in length and two angles are equal in size.
An individual angle can have any size you like. The only constraint is on the sum of all 19 angles.
The question can be answered only if the 20-gon is regular - ie all its angles are the same. IF that is the case, then: The sum of the exterior angles of any polygon is 360 degrees. Since there are 20 exterior angles, each of them must be 360/20 = 18 degrees.
If it is a regular 12 sided polygon then each interior angle is 150 degrees.
A dodecagon is a 12 sided polygon
If its a regular polygon then its 147 degrees.
The sum of the angles of a polygon is equal to 180° times (n-2) where n is the number of sides.For a 23-sided polygon, that would give a total of (180°) x (21) = 3780°. If the angles are all the same, each would be 3780° ÷ 23 = 164.3478°
For a polygon of that size, scientists would use the term "nonillion-gon."