Tolong dijawab ya nomer 15

Tolong dijawab ya nomer 15

Jawaban Terkonfirmasi

$V=frac{1}{3}pi r^2t \ 770=frac{1}{3}timesfrac{22}{7}times r^2times 15 \ r^2=770:frac{22}{7}:frac{1}{3}:15 \ r^2=770timesfrac{7}{22}times 3timesfrac{1}{15} \ r^2=70timesfrac{7}{2}timesfrac{1}{5} \ r^2=7times 7 \ r^2=49 \ r=sqrt{49} \ boxed{r=7$ cm$;;;[C]}$

Jawaban Terkonfirmasi

Diketahui :
t = 15 cm
V = 770 cm^3
π = 22/7

Maka,
V = 1/3 x π x r² x t
770 = 1/3 x 22/7 x r² x 15
770 = 22/7 x r² x 5
r² = 770 : 22/7 : 5
r² = 770 x 7/22 : 5
r² = 245 : 5
r² = 49
r = √49
r = 7 cm

Jadi jari-jari alasnya adalah 7 cm