Jawabanmu

2014-05-22T20:35:26+07:00
Kll = 2 phi r
44 cm = 2 * 22/7 * r
44 cm x 7 = 2 * 22 * r
308 cm = 44 r
r = 308 cm/44
r = 7 cm

L = phi r^2
L = 22/7 * 7 cm * 7 cm
L = 22 cm * 7 cm
L = 154 cm^2

semoga membantu..... :)
1 5 1