Answer:
The minimum number of rolls to buy is 9
Explanation:
step 1
Find the perimeter of the ceiling of Katie’s living room
The perimeter of a square is equal to
where
b is the length side of the square
we have
so
step 2
Find the length side of the diagonals of the ceiling
Applying Pythagoras theorem
step 3
Find the total crepe paper needed
Sum the perimeter plus two times the length side of the diagonal
step 4
Find the number of rolls needed
we know that
Each roll contain 10 ft of crepe paper
so
Round up
The minimum number of rolls to buy is 9
He needs 24 more plants, so he will have 32 rows and 32 columns, an equal number of rows and columns.
