Jawabanmu

2014-05-28T14:31:21+07:00
Derajat = 60
1 Lingkaran = 360 derajat

Derajat Juring = 60 / 360 = 1/6 lingkaran
r = 6cm
phi = 3,14

luas juring = 
1/6 * phi * r * r
1/6 * 3,14 * 6 * 6
18.84 cm²