Luas selimut kerucut 204,1 cm2 jari jari 5 cm,pi=3,14 maka volume kerucut?
DNurfadillah
Cari tinggi kerucut dulu : luas selimut = r s 204,1 = 3,14 x 5 x s 204,1 = 15,7 s s = 204,1/15,7 = 13
t. kerucut = s^2 - r^2 = 13^2 - 5^2 = 169 - 25 = √144 = 12 cm
v. kerucut = 1/3 r^2t = 1/3 x 3,14 x 25 x 12 = 1/3 x 942 = 314 cm^2
smoga bnar yah :)
15 votes Thanks 36
5elok
Ls = 204,1 r = 5 cm phi = 3,14 Ls = phi x r x s 204,1 = 3,14 x 5 x s s = 204,1 /3,14 x 5 s = 13 phytagoras dari r, s, dan t 5, 13, 12 v = phi x r x r x t v = 1/3 x 3,14 x 5 x 5 x 12 = 314
4 votes Thanks 11
5elok
maff, kurang dikali 1/3, jadi jawabannya 314
luas selimut = r s
204,1 = 3,14 x 5 x s
204,1 = 15,7 s
s = 204,1/15,7 = 13
t. kerucut = s^2 - r^2
= 13^2 - 5^2
= 169 - 25 = √144 = 12 cm
v. kerucut = 1/3 r^2t
= 1/3 x 3,14 x 25 x 12
= 1/3 x 942
= 314 cm^2
smoga bnar yah :)
r = 5 cm
phi = 3,14
Ls = phi x r x s
204,1 = 3,14 x 5 x s
s = 204,1 /3,14 x 5
s = 13
phytagoras dari r, s, dan t
5, 13, 12
v = phi x r x r x t
v = 1/3 x 3,14 x 5 x 5 x 12
= 314