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t = 9 cm
120 = 22/7. r²
r = √(420/11) = 2/11 √1155 cm
phi.r² = 120
3,14.r² = 120
r² = 120 : 3,14
r² = 38,2
r = √38,2
r =6,18 cm
V kerucut = 360
1/3.phi.r².t = 360
1/3.3,14.(6,18)².t = 360
1/3.3,14.38,1924.t = 360
119,924136.t = 360.3
119,924136.t = 1080
t = 9,006 arau 9,01 cm