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308 = 3,14 . r2 . 20
=62,8 .r2
r2 = 308:62,8 = 4,9
r = 2,3
diameter = 4,6
308= 20a
a= 15.4
alas = Πr^2 ket ^2=pangkat 2
15.4=3.14r^2
r^2= 15.4 /3.14
r= √15.4/√3.14
d=2r
d = 2.√15.4/√3.14