Jawabanmu

2014-04-15T11:15:28+07:00
P=nr+2 \pi
p=6×21+2× \frac{22}{7} ×21
p=126+132=258cm
2014-04-15T11:21:38+07:00
p=6×21+2×22/7×21
=  126+132
 =258cm


maaf kalau salah :)