Sebuah kerucut setinggi 30 cm memiliki alas dengan keliling 66 cm ( phi = 22/7 ). Volum kerucut tersebut adalah? Caranya jga yak
greezyzilla
T = 30 phi = 22/7 ----------------------- Keliling = 2 x phi x r 66 = 2 x 22/7 x r (66/2) x (7/22) = r 21/2 = r ---------------------- Volume = 1/3 x l.alas x t Volume = 1/3 x 22/7 x 21/2 x 21/2 x 30 Volume = 11 x 3 x 21 x 5 Volume = 3465 cm^3
phi = 22/7
-----------------------
Keliling = 2 x phi x r
66 = 2 x 22/7 x r
(66/2) x (7/22) = r
21/2 = r
----------------------
Volume = 1/3 x l.alas x t
Volume = 1/3 x 22/7 x 21/2 x 21/2 x 30
Volume = 11 x 3 x 21 x 5
Volume = 3465 cm^3
Kayaknya begitu :v