Tolong nmr 6 dong.... bsk dikumpulin. dengan cara kerjanya.

kel bibir gelas = 2phir
22 = 2 × 3,14 × r
22/2 = 3,14 × r
11 = 3,14 × r
11/3,14 = r
r = 3,5

v kerucut = 1/3 phi × r2 ×t
= 1/3 × 22/7 × 7/2 × 7/2 × 10
= 385/3
= 128,33