Question

Panjang garis pelukis kerucut 12,5 cm jika jari-jari alas 3,5 cm maka volumenya adalah

Answer 1

V= 1/3 x phi x r^2 x t
cari t dulu
t= akar s^2-r^2
t= akar 12,5^2-3,5^2
t= akar 144
t= 12cm
v= 1/3 x 22/7 x 3,5^2 x 12
v= 1/3 x 22/7 x 147
v= 1/3 x 462
v= 154cm^2

Answer 2

T²= s²-r²
t²= 12,5²-3,5²
t²= 156,25-12,25
t=√144
t= 12 cm

Vk= ⅓×πr²×t
⅓×22/7×3,5×3,5×12
= 154 cm³