tolong ya plis no 1,2,3 pake cara terima kasih

V = Luas alas x tinggi
V = phi x r x r x t
1540 = 22/7 x 7 x 7 x t
1540 = 154 x t
t = 1540/154
t = 10 cm

1.d = 14 cm
r = d/2 = 14/2=7 cm
v = 1540 cm^3
v = πr^2t
1540 = 22/7 × 7^2 × t
1540 = 22/7 × 7 × 7 × t
1540 = 154 t
t = 1540/154
t = 10 cm


2. v = 720 cm3
Lalas = 120 cm2

V = Lalas × t
720 = 120× t
t = 720/120
t = 6 cm

p - l = 2 cm
p = l + 2

Lalas = p × l
120 = (l + 2) l
120 = l^2 + 2l
1 + 120 = l^2 + 2l +1
121 = (l + 1)^2
l + 1 = akar 121
l + 1 = 11
l = 11 - 1
l = 10 cm

p = l + 2
p = 10 + 2 = 12 cm


3. ttabung = tkubus
Vkubus = 2744 dm^2

Vkubus = s^3
2744 = s^3
s = akar3 dari 2744
s = 14 dm = tkubus

tkubus = tbalok = 14 dm
dtabung = 3/4 t
d = 3/4 × 14
d = 10,5 cm
r = d/2
r = 10,5/2
r = 5,25 dm

Vtabung = πr^2t
v = 3,14 × (5,25)^2 × 14
v = 1211,6 dm^3