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t² = s² - r²
t² = (15)² - (9)²
t² = 225 - 81
t² = 144
t = cm
t = 12 cm
Volume Kerucut
V = x x r² x t
V = x 3,14 x (9)² x 12
V = x 3,14 x 81 x 12
V = 3,14 x 81 x 4
V = 1.017,36 cm³
Jadi, volume kerucut tersebut adalah 1.017,36 cm³
d = 18 cm
r = 9 cm
s = 15 cm -> t = 12 (menggunakan triple phytagoras)
Dit :
V =....?
Jwb :
V = 1/3 x π x r² x t
V = 1/3 x 3,14 x 9 x 9 x 12
V = 3,14 x 3 x 9 x 12
V = 3,14 x 27 x 12
V = 1.017,36 cm³