The radius of a circular flower bed with a diameter of 1 and 16m is 16÷2=8 (m). After paving a 2m-wide path, the radius of the great circle is 8+2= 10 (m).

The path is circular with an area of (10? -8? ×3. 14 = 36×3. 14 = 1 13.04(m？ )

2. The diameter of the largest circle is the wide side of a rectangle, and its area is: (0.6.

÷

2)? ×3. 14=0.2826 (m？ )

3. Roll forward for one cycle: 9×3. 14=28.26 (decimeter), and the forward distance per minute is 1000 cycle: 28.26×1000 = 28,260 (decimeter).

The distance per hour is: 28260×60= 1695600 (decimeter) = 169.56 (km).

4.1.8m =180cm

1.2m = 120cm

The diameter of the cutting circle is 30×2=60 (cm).

The number of lines that can be cut along the long side is: 180÷60=3 (blocks).

The number of lines that can be cut along the wide edge is:

120÷60=2 (pieces)

A * * * can be cut: 3×2=6 (pieces)

The utilization rate is: (30? ×3. 14×6)÷( 180× 120)=78.5%