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In general you would need to select a vertex of the nonagon and join it to the other vertices (except the two adjacent ones). This will divide the nonangon into 7 triangles. Measure the sides and/or angles of these triangles and calculate their areas. Add these together to get the area of the nonagon.
If the nonagon is regular then there are formulae to calculate its area. These depend on whether you know the side length, apothem or circumradius.
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Continue Learning about Geometry
How do you find the perimeter of nonagon?
You add together the lengths of the nine sides of the nonagon.
Area of a regular nonagon with a perimeter of 144?
The area is 1583 square units, approx.
What is the area of a regular nonagon with a radius of 14in?
Approx 566.9 square inches.
What is the area of a regular nonagon with a side length of 9 and an apothem of 16?
A regular nonagon with a side length of 9 has an apothem of 12.4 not 16. So the question is inconsistent.
What is the name for the nine-sided polygon?
nonagon
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