### Home > CC3 > Chapter Ch10 > Lesson 10.1.5 > Problem 10-70

10-70.

The label wraps around a cylinder.

It may be useful to draw a net of this cylinder.

You know the equation for the area of a rectangle can be found using the formula:

Area = (base)(height)

Substitute the known values and solve for the unknown value.

140 = (base)(7)

base = 20 inches

You learned that the width of the rectangle is equal to the circumference of the circle. Substitute the known values into the following equation and solve for the diameter:

Circumference = (diameter)π

20 = (diameter) · π

Diameter = ?