A candy cane 20 cm high has a circumference of 3 cm. The red “ribbon” makes exactly 4 complete turns round the candy cane while its two ends touch the cane's top and bottom. How long is the ribbon in cm?

Answer 1

Visualize the candy cane made in the form of a paper cylinder.
Cut the cylinder open, you will see that the "ribbon" around the candy cane or cylinder consists of 4 diagonals for 4 different rectangles.
the height of each of those rectangles is 20/4 or 5 cm
and the width is 3 cm
So the diagonal or hypotenuse is ..
√(5^2 + 3^2) = √34

So the length of the "ribbon" is 4√34