Jawabanmu

2014-04-03T07:34:45+07:00
 \pi 120/360=27/x
x=81cm2
r2=L/pi
r2=81/pi
r=9/akar pi
2014-04-03T07:35:57+07:00
L.juruing=120/360x π r kuadrat 27π =1/3π r kuadrat sama sama punya phi,phi nya bs di coret r kuadrat= 27:1\3 r.kuadrat=27x3\1=81 r=√81 r=9 cm