Answer:
a cardboard of 40 inches sq needs to be used.
Step-by-step explanation:
first we add area of the two triangles on the top
=1/2×4×1×2 (half into base into height gives the area of a triangle) where 1 inch is the ht and 4 cm the base, each
= 4 inches sq.
now the rectangle in between has an area of 2×8 = 16 inches sq
now the largest traingle has an area of 1/2×5×8 = 20 inches sq, were 5 is the ht and 8 the base.
so on adding the 3 we get the area of the cardboard = 40 inches sq.
hope this helps you and Mark me the brainliest.
