Jawabanmu

2014-04-04T16:47:51+07:00
K1/4ling=1/4.2.phi.r
           =1/4.2.22/7.7
           =11cm

20+14+22=56cm
2014-04-04T18:27:28+07:00
1/2πd + 20 = 1/2×22/7×14 + 20 + 14= 22+20+14 = 56 cm