Please give me a full exlpanation.
Pat starts with two identical square pieces of paper. On the first one, she draws straight lines that divide the paper into a 3-by-3 grid of squares. The total length of the lines she draws is 18 cm
On the second piece of paper, Pat draws straight lines that divide the paper into a 6-by-6 grid of squares.
What is the total length of the lines that Pat draws on the second piece of paper?
