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luas alas = π x r²
luas alas = 3,14 x 5²
luas alas = 3,14 x 25
luas alas = 78,5
volume tabung = luas alas x tinggi
volume tabung = 78,5 x 30
volume tabung = 2355 cm³
lalu rumus volume kerucut = 1/3 x luas alas x tinggi
= 1/3 x 78,5 x 30
= 1/3 x 2355
= 785 cm³
volume tabung : volume kerucut
2355 : 785
3 : 1