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Molochitis
the area for a regular decagon is a bit complicated to type out, but a quick google search "decagon formula" should bring it up.

its like A= (5/2) a^2 sqrt(5+2*sqrt(5)) so yeah just google that and plug the values that they gave you in

i got 1107.97~

the perimeter is P = 10a where a is the side length. in this case it is 12. so the perimeter is 10*(12) which is 120cm.


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