SOLUTION: 20. https://answers.yahoo.com/question/index?qid=20200327181650AAopmOu

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Question 1154616: 20.
https://answers.yahoo.com/question/index?qid=20200327181650AAopmOu
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Your regular polygon would be an equilateral triangle. It is composed on six special 30-60-90 congruent triangles, each having a short leg of 10%2Asqrt%283%29. You should be able to use that to find the area of your figure.