Jawabanmu

2014-05-20T23:06:55+07:00
L = phi x r²
154 = 22/7 x r²
7/22 x 154 = r
²
7 x 7 = r
²
49 = r
²
7 = r
²

diameter = r x 2
             = 7 x 2
             = 14
makasih banget ya... Dinialyamah
Okey. Jadiin jawaban terbaik dong =)
2014-05-21T02:25:56+07:00
Luas = phi * r^2
154 = 22/7 * r^2
r^2 = 154 * 7/22
r^2 = 49
r= √49
r= 7

Jadi diameter = 2 * r = 2*7 = 14 cm