Posted by **Skye** on Sunday, March 6, 2011 at 7:27pm.

a=?

s=10.5cm

A= 19,887.5cm squared

Pentagon

A=asn/2

19,887.5cm=a*10.5*5/2

39775=52.5a

a=757.61cm?

am i correct?

regular nonagon

a=9.6cm

A=302.4cm squared

find perimeter thanks!

- geometry regular polygon -
**JJ**, Thursday, February 2, 2012 at 7:07pm
302.4cm^2

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