Jawabanmu

2014-05-01T20:55:05+07:00
2 phi r 2 3,14 20 6,16 x 20 123,2 cm
1 5 1
2014-05-01T20:55:54+07:00
Diket:
r = 20 cm
d = 40 cm

Dit : K ?

jwb:

K =  \pi .d

K = 3,14 x 40
K = 125,6 cm