Question

Volume kerucut dengan keliling alas 44 dan tinggi panjang garis pelukis 25 cm adalah

Answer 1

Cari dulu jari-jarinya
kll alas = 44
2πr = 44
2 . 22/7 . r = 44
44/7 . r = 44
r = 44 . 7/44
r = 308/44
r = 7 cm

cari tinggi
t^2 = s^2 - r^2
= 25^2 - 7^2
= 625 - 49
= 576
t = √576
= 24 cm

Volume kerucut
= 1/3πr^2t
= 1/3 . 22/7 . 7 . 7 . 24
= 1/3 . 22 . 7 . 24
= 1/3 . 154 . 24
= 1/3 . 3696
= 1232 cm^3