kievan bought a new eraser that came in a cardboard wrapper.

what is the minimum amount of cardboard used for the wrapper?
38cm^2
40cm^2
76cm^2
80cm^2

it's not 40

Third option.

Step-by-step explanation:

You need to find the surface area with the formula for calculate the surface area of a rectangular prism:

Where w is the width, l is the length, and h is the height.

You can observe in the figure that:

Then, substituting the values into the formula  , you get that  minimum amount of cardboard used for the wrapper is:

13cm

step-by-step explanation:

(apex)