Answer:
34 cm
Step-by-step explanation:
The actual question is How many inches of ribbon Peter will need to make the "X".
Using the Pythagorean theorem, the length of the diagonal of a square with 12 cm sides is:
[tex]d^2=12^2+12^2\\d=\sqrt{288}\\ d=16.97\ cm[/tex]
Since the "X" requires two diagonals, the length of ribbon required is:
[tex]L=2*16.97\\L=34\ cm[/tex]
The length required, rounded to the nearest centimeter, is 34 cm.
