The radius of the semicircle passed by the small ant is r=6+2=8cm.

Its climbing distance is s =12 * 2+3.14 * 8 = 49.12 cm.

The radius of the semicircle that the small snail passes through is r=6cm.

Its climbing distance is s =12 * 2+3.14 * 6 = 42.84 cm.

The distance they climbed was 49. 12-42.84=6.28cm.

I hope it helps.

I wish you a happy study.