Sebuah kerucut memiliki luas alas 120cm2.jika volumenya 360cm3,maka tentukan tinggi dan jari jari kerucut tersebut
5dregensleyer
Volum = 1/3 x La x t 360 = 1/3 x 120 x t 360 = 40 t 360/40= t 36/4 = t 9 = t luas alas = 120 π x r² = 120 r² = 120 x 7/22 r² = 38,18 r = √38,18 r = 6,17 cm
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AnandaHafidhR
V kerucut = 1/3 L.a x t 360 cm³ = 1/3 120cm² x t 360 cm³ = 40 x t t = 360/40 t = 9 cm
L.a kerucut = πr² 120 cm² = 22/7 r² r² = 120 x 7/22 r² = 840/22 r² = 38,18 r = √38,18 r = 6,18 cm
360 = 1/3 x 120 x t
360 = 40 t
360/40= t
36/4 = t
9 = t
luas alas = 120
π x r² = 120
r² = 120 x 7/22
r² = 38,18
r = √38,18
r = 6,17 cm
360 cm³ = 1/3 120cm² x t
360 cm³ = 40 x t
t = 360/40
t = 9 cm
L.a kerucut = πr²
120 cm² = 22/7 r²
r² = 120 x 7/22
r² = 840/22
r² = 38,18
r = √38,18
r = 6,18 cm