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 = ?