Question

A company packages bottles of olive oil in cylindrical cardboard tubes completely wrapped with paper. If each tube has a diameter of 3 inches and is 11 inches tall, approximately how

many square inches of paper is needed to wrap each tube? (Use 3.14 to approximate w.)
O 78
O
104
118
160

Answer 1

118

Explanation:

We need to calculate the surface square of the cylinder. The formula for that is S=2*pi*r*(r+h). r is radius of the cylinder which is diameter/2=3/2=1.5. The formula becomes: S=2*pi*1.5(1.5+11)=37.5pi=~117.5 which is approximated to 118 since if the decimal you're approximating is 5 or higher it just increments the previous one, so here we just add 1 to 117