How do we find the area of a nonagon if each side is 3 cm? Please and thanks.

Question

anonymous · Answer

Nanagon has nine sides. So, it forms 9 triangles with the center. Find the area of one of these triangles and multiply by 9.

anonymous · Answer

6,18182*3^2 = 55,6364

anonymous · Answer

No, it is not.

anonymous · Answer

$$area= \left( s ^{2}N \right) \div \left( 4\tan \left( 180/N \right) \right)$$  

Where s is the length of any side
N number of sides
in your case, N=9, s=0.03 meters

anonymous · Answer

It is 6.18182 not 6,18182.

Also, using a formula like that blindly is silly.

anonymous · Answer

omar_86 - using a formula like that is also silly. Best to figure it out from the shape and triangles formed. The formula came from doing that fundamental math.

anonymous · Answer

Dear GT, both ways are right...

anonymous · Answer

Plugging values into a formula does not teach anyone anything.

anonymous · Answer

I did it for 7-gon. Sorry. It is a 9-gon.

anonymous · Answer

|dw:1327934436452:dw|