Tempat air berbentuk tabung berisi air setinggi 5dm ,jika volume air 1570 liter,maka diameter alas tabung adalah......

r^2 =>> V / π × t
=>> 1.570 / 3,14 × 5
=>> 1.570 / 15,7
=>> 100
r =>> √ 100
r =>> 10 dn
d =>> 20 dm

Volume tabung = π r2 t
1.570 = 3,14 kali r2 kali 5
1.570 = 15,7 kali r2
r2 = 1.570 : 15,7 = 100
r = √100 = 10 dm
diameter = 20 dm