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r = 31,4 / 2 (3.14) = 10/2 = 5
s = 13
t = √(s² -r²) --> t= 12
V kerucut = 1/3 π r² t
V = 1/3 (3.14)(5²)(12)
V = 4 (3,14)(25)
V = 100(3,14)
V = 314 cm³