What is the area of a Nonagon if the radius is 8 in. Answer must be rounded to the nearest tenth.

Here is some of my work.

I found a formula online that could help. It was nr^2tan(180/n) where n=number of sides and r=radius

If that is the case, I got 576(tan20) as an answer, which equals 1288.6 rounded......I have doubts to that answer....

Am I right or wrong....Any help is greatly appreciated....

Is there a possible generalization to this too? (for any # sided polygon)

Here is some of my work.

I found a formula online that could help. It was nr^2tan(180/n) where n=number of sides and r=radius

If that is the case, I got 576(tan20) as an answer, which equals 1288.6 rounded......I have doubts to that answer....

Am I right or wrong....Any help is greatly appreciated....

Is there a possible generalization to this too? (for any # sided polygon)

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