Jawabanmu

2014-03-31T21:11:01+07:00
Keliling lingkaran + n.diameter
2 x 3.14 x 9 + 4 x 18
128.52 cm

2014-03-31T21:43:31+07:00
Keliling lingkaran + n . diameter
2 \pi r + 4 . 18
2. 3,14 . 9 + 72
56,52 + 72
128,52