Jawabanmu

2014-09-09T19:56:47+07:00
A. 6280 = 3,14.r^2.20
314 = 3,14.r^2
100 = r^2
10=r

B. L = 3,14.10.10 + 2.3,14.10.20
L=314 + 1256
L=1570 cm^2