Answer:
624 square inches of cardboard were used to make the box.
Step-by-step explanation:
Slant height of the box = l = 20 inches
Side of the base of the box = s = 12 inch
Area of the base = [tex]s^2[/tex]
Area of triangular face = [tex]\frac{1}{2}\times s\time l[/tex]
There are 4 triangle faces, and single square base , so the total area is :
[tex]T=s^2+4\times \frac{1}{2}s\times h[/tex]
[tex]=(12 inch)^2+4\times \frac{1}{2}\times 12 inch\times 20 inch[/tex]
[tex]T=624 inch^2[/tex]
624 square inches of cardboard were used to make the box.
