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ob=2πr
12π=2πr |:2π
6=r
r=6
a=r
Ob(czworokąta)=4a
ob=4*6
ob=24(cm2)
odp.Obwód czworokąta foremnego wynosi 24 (cm2)
L=2πr
12π=2πr / :π
12=2r /:2
r=6 cm
r= a√2/2
12=a√2/2
a=6√2
L=4a
L= 4*6√2
L=24√2 cm