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p busur = keliling alas kerucut
kell alas kerucut = 2
31,4 = 2.3,14.r
31,4 : 2.3,14 = r
5 = r
t kerucut = s² - r² = 13²-5² = 169-25 = √144 = 12 cm
V kerucut = 1/3