Answer
41 in x 20 in
Work Step by Step
As shown in the diagram, each flap is 10 inches wide and 5 inches tall, as 2 flaps fold together to cover the 10x10 base. The section for each side is 10 inches wide and 20 inches tall. The glue edge adds 1 inch to the width of the cardboard. Add the widths and heights to find the overall dimension.
$W=(4\times10)+1=40+1=41$
$H=5+10+5=20$
