All Depends If You or Your child Is Ready For that kinda stuff I would say the correct age would be around 16-18
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For any N-sided polygon: Sum of the interior angles can be found by (N-2)*180°. Note that a 3 sided polygon (triangle) is the least number of sides possible. So for 18 sides: (18-2)*180° = 2880°
(18-2)*180 = 2880 degrees
(18-2)*180 = 2880 degrees
octadecagon is the name of a 2 d 18 sided polygon. The octa part is for 8 and the deca is for 10 since 18=10+8
If the 20-sided polygon is a regular polygon, then:The sum of all 20 angles = (20 - 2)180⁰ = 18(180⁰) = 3240⁰Each angle measure = 3240⁰/20 = 162⁰