Alex designed the model of a cylindrical water tank to be installed in a park. The model has a radius of 5 cm and a height of 14 cm. The dimensions of the actual water tanks that will be installed in the park are 8 times larger than the model. The total surface area of the actual water tanks, rounded to the nearest whole number, is _________ cm2. Use 22/7 for pi.

Question

Alex designed the model of a cylindrical water tank to be installed in a park. The model has a radius of 5 cm and a height of 14 cm. The dimensions of the actual water tanks that will be installed in the park are 8 times larger than the model. The total surface area of the actual water tanks, rounded to the nearest whole number, is _________ cm2. Use 22/7  for pi.

anonymous · Answer

model dimensions
r=5
h=14

actual dimensions
r=40
h=112

now to figure out the the surface area would be to make a diagram

anonymous · Answer

|dw:1337142297291:dw|

anonymous · Answer

now by this picture you can see you'll need the surface of the top and bottom

the surface area for that would be 2pir^2

anonymous · Answer

lastly if you think of the last part as a piece of a paper around it you'd get|dw:1337142509593:dw|