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22 / 7 x d = 66 cm
d = 66 cm x 7/22 = 21 cm
r = 21 / 2 cm
volume kerucut = 1/3 x 22/7 x 21/2 x 21/2 x 30
= 33 cm2 x 5 cm = 165 cm3
semoga bermanfaat :)
=> 66 = 2 x 22/7 x r
66 = 44r/7
462 = 44r
r = 10,5cm
vol Kerucut
= 1/3 x luas alas x tinggi kerucut
1/3 x 22/7 x 10,5 x 10,5 x 30
3465cm³