Question

Alex designed the model of a cylindrical water tank to be installed in a park. The model has a radius of 4 cm and a height of 12 cm. The dimensions of the actual water tanks that will be installed in the park are 5 times larger than the model. The total surface area of the actual water tanks, rounded to the nearest whole number, is _________ cm2. Use 22 over 7 for pi.

Answer 1

you have surface area of cylinder as \[2\pi r ^{2}(r+h)\]
and you have dimensions as R=5*r
and H=5*h
solve it by your self

Answer 2

my answer is 7536?????????????????????

Answer 3

the dimesions of large tank is 5 times smaller one
its height=60 cm
radius=20cm
ttotal surface area=2*pie*r*h+pie*r*r*
2*22/7*20*60+22/7*20*20
=8792

Answer 4

oops i put wrong formula sorry guys. . .
\[2 \pi r(r+h)\]
let him solve by himself just tell the formula. . .

Answer 5

@theyatin wtf I don't undertstand explain

Answer 6

ok 2πr(r+h)
is the formula of surface area of cylinder
and its is given that original cylender has five times as dimensions of model so
R=5r(5*4cm) and H=5h(5*12cm)
hence put values and solve

Answer 7

all I see is number and letters

Answer 8

ohk 2πr(r+h)= 2* 22/7* 20cm (20cm+60 cm)= solve it