80. A perfectly smooth sphere, having the same size as the Earth, is encircled by a wire at the equator. This wire was extended by one meter and arranged so that an equal gap was formed between the wire and the surface of the sphere. Would a mouse be able to squeeze through the resulting gap?
80. If the circumference of a circle increases by 1 m, then the radius of the circle will increase by $1: 2 \pi \approx 16 \text{ cm}$, i.e., the gap formed will be large enough for not only a mouse but also a cat to pass through.