1. The ceiling of Katie’s living room is a square that is 15 ft long on each side. To decorate for a party, she plans to hang crepe paper around the perimeter of the ceiling and then from each corner to the opposite corner. Katie can buy rolls that each contain 20 ft of crepe paper. What is the minimum number of rolls she should buy? Katie’s living room is a square that is 15 ft long on each side Show your work.
The perimeter of a square is p=4s and we wish to know how many 20ft rolls of crepe paper are needed to equal this perimeter or more... 20n≥4s we know s=15ft so 20n≥60 upon division by 20 of both sides... n≥3 So the minimum would be 3 rolls.