manningbernadin manningbernadin
  • 02-05-2018
  • Mathematics
contestada

find the area of the regular decagon if the apothem is 2.8ft and a side is 1.8ft

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jdoe0001 jdoe0001
  • 02-05-2018
DECA=10, decagon = 10 sides.

since each side is 1.8 long, all 10 sides will be 10*1.8 or 18 units long, so that'd be the perimeter then,

[tex]\bf \textit{area of a regular polygon}\\\\ A=\cfrac{1}{2}ap~~ \begin{cases} a=apothem\\ p=perimeter\\ ------\\ a=2.8\\ p=18 \end{cases}\implies A=\cfrac{1}{2}(2.8)(18)[/tex]
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