tolong jawab kan soal nmor 2 serta cara nya

K = 2 x pi x r
66 = 2 x 22/7 x r
66 = 44/7 x r
66 x 7/44 = r
r = 10,5 --> d = 2r = 2 x10,5 = 21 cm

Cari luas alas
La = 1/4 x pi x d x d
La = 1/4 x 22/7 x 21 x 21
La = 1/4 x 22 x 3 x 21
La = 346,5 cm2

Mencari Vkerucut
V = 1/3 x La x t
V = 1/3 x 346,5 x30
V = 10 x 346,5
V = 3.465 cm3

Jadi volumenya 3.465 cm3

Smgmbntu^-^