The circumference of a circle is 2πr, and the total circumference of three beer bottles is 5 cm radius.

5×2×3. 14×3=94.2

We can think about it. If three wine bottles are arranged in a row, we don't need three perimeters, one of which uses bottle diameter and the other two use semicircles. In other words, the circumference of a bottle plus the diameters of two bottles is the length required to tie a circle, as follows:

2πr+2r×3 (why is it multiplied by 3 here because it will circle the middle bottle twice, and the radii of the first and third bottles will give 3) = 5× 2× 3.14+5× 2× 2 = 61.4 (cm).

If it's 8 cm, we'll bring it in. This formula is

8×2×3. 14+8×2×3=98.24 cm

I'll attach a picture to you later, and you'll understand by making a picture.