tolong dong kerjain no.18 yang a dan b berserta caranya yaa(: besok dikumpul tolong yaaa

v = πr^t/3
= 3,14×5/2×5/2×3/3
= 19,625 m kubik

a. berat pasir = 19,625×7=137,375 kuintal = 13,7375 ton
b. harga = 20.606.250