#1**+1 **

The radius of the cylinder = 30mm

And its length = 240 mm

So....the lateral surface area is 2pi * radius * length =

2pi * 30 * 240 = 14400 pi mm^2

And the surface area of the two ends is pi * 30^2 = 900pi mm^2

So the total surface area of the cylinder is [ 14400+ 900 ]pi mm^2 = 15300 pi mm^2 ≈

48,066 mm^2

The total surface area of the box is

[2* 120^2 + 4*120*60 ] = 57,600 mm^2

So the cylinder has the smaller surface area

CPhill
Oct 7, 2017