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K = 2 . π . r
31,4 = 2 . 3,14 . r
31,4 = 6,28 . r
31,4/6,28 = r
5 = r
(mencari tinggi kerucut)
t² = s² - r²
t² = 13² - 5²
t² = 169 - 25
t² = 144
t = √144
t = 12
Jadi, tinggi kerucut adalah 12 cm