Jawabanmu

2014-06-09T11:37:30+07:00
R = 30 cm
d = 30 x 2 = 60 cm

4d + Kel. Lingkaran
4(60) + (3,14x60)
240 + 188,4
428,4
2014-06-09T11:51:54+07:00
8r + kel.lingkaran
8(30) + (2x3,14x30)
240 + 188,4
428,4