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t = v.tabung/l.ingkaran
t = 3080/154
t = 20
2. l.ligkaran = 1/2 x p x rkuadrat
157 = 1/2 x 3.14 x r kuadrat
rkuadrat = 157/1, 57
r kuadrat = 100
r = akar 100 = 10
L.alas= . r²
154=22/7.r²
154.7/22=r²
49=r²
√49=r
7=r
V.tabung= . r². t
3080= 22/7 . 7.7 .t (sederhanakan)
3080= 154.t
3080/154=t
20=t
2.
L.stengahlngkrn= 1/2 . r²
157= 1/2 . 3,14 . r² (sderhanakan)
157=1,57. r²
157/1,57=r²
100=r²
√100=r
10=r