hitunglah keliling alas kerucut jika volume 616 cm3 tinggi 12 cm dan phi 22/7

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V = 1/3 × 22/7 × r² × t
616 = 1/3 × 22/7 × r² × 12
616 = 4 × 22/7 × r²
616 = 88/7 × r²
r² = 616 ÷ 88/7
r² = 616 × 7/88
r² = 49
r = √49 = 7

Keliling alas =  2πr
K = 2 × 22/7 × 7
K = 44 cm