Anonymous

I'm assuming you mean a regular n-gon. First divide the n-gon radially into n congruent, isosceles triangles. Each triangle has vertex angle = 360°/n. Find the area of the triangle. Area of the n-gon = n(area of triangle)

Anonymous

http://www.mathwords.com/a/area_regular_...

Anonymous

If you are referencing your other question; I've already answered it. Answer: 20 sq. units

Anonymous

If you are given the coordinates of the vertices, then: https://www.mathopenref.com/coordpolygonarea.html

Anonymous

This should help you... https://m.wikihow.com/Calculate-the-Area...