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Tentukan jari-jari terlebih dahulu:
La = π r²
Dengan:
28,26 = 3,14 x r²
r² = 28,26 / 3,14
r² = 9
r = √9 = 3 cm
Dengan r = 3 cm, berlaku:
t = √s² - r²
t = √5² - 3²
t = √25 - 9
t = √16
t = 4 cm
Dengan tinggi 4 cm, berlaku:
V = 1/3 x La x t
V = 1/3 x 28,26 x 4
V = 113,04 / 3
V = 11304/300
V = 942/25
V = 37,68 cm³