The minimum number of rolls that can be bought is 4.
The first step is to determine the perimeter of the ceiling and the length of its hypotenuse.
Perimeter of the ceiling = perimeter of a square = 4 x length = 4 x 16 = 64 ft
The hypotenuse is the distance from one corner of the ceiling to the other corner of the ceiling. The hypotenuse would be determined using the Pythagoras theorem.
The Pythagoras theorem: a² + b² = c²
where a = length
b = base
c = hypotenuse
16² + 16²
= 256 + 256
= 512 feet
c = √512 = 22.6 feet
Total length = 22.6 feet + 64 feet = 86.63 feet
Minimum number of rolls = 86.63 / 25 = 3.46 = 4
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