2. For a round vegetable field, the length of the fence around it is 18.84m, so its radius is (18.84 divided by 6.28= 3) m, and the area of this field is (3 squared times 3. 14 28.26) m2.

3. Draw a circle with a circumference of 12.56 cm, the distance between the two feet of the compass should be (2) cm, and the area of this circle is (12.26) cm 2.

The hour hand of the clock is 4 cm long and (25.6438+02) cm away from the tip of the hour hand.

5. Given that the width of a rectangle is 2cm, the length of this rectangle is (x) cm and the area is (x*2=2x) cm 2.

6. Cut a piece of paper with a length of 8 decimeters and a width of 6 decimeters into the largest circle with an area of (28.26) square decimeters.

7. A circular garden with a diameter of 10 meter is surrounded by a fence. How long is the fence? What is its floor space?

10 * 3.14 = 31.4 (m)

10/2=5 (m)

5*5*3. 14=78.5 square meters

Answer: The circumference is 3 1.4m and the area is 78.5m2.

8. The wheel radius of Xiaojun bicycle is 40 cm, and the wheel rotates 100 times per minute. How many minutes does it take him to cross the 25 12 meter bridge?

40*2=80 cm

80 * 3.14 *100 = 25120 (cm)

25120m = 2512000m

2512000/25120 =10 (minutes)

A: It takes about 10 minutes.

9. Build a gravel road with a width of 2 meters around the circular flower bed with a diameter of 20 meters. What is the area of this gravel road?

20=2=22 (meter)

22/2= 1 1 (m)

20/2= 10 (m)

11*1* 3.14 = 379.94 (square meter)

10 *10 * 3.14 = 314 (square meter)

379.94-34=65.94 square meters

The area of this gravel road is 65.94 square meters.

10. The diameter of the hula hoop is 0.7 meters. The red on the ground rolls the hula hoop five times in a straight line. How many meters did the hula hoop roll?

0.7*3. 14*5= 10.99 (m)

A: The hula hoop rolled 10.99 meters.

1 1. In a circular flower bed with a radius of 6 meters, 100-200 peony flowers were planted. What is the planting area of peony flowers?

6 * 6 * 3.14 =113.04 (m2)

113.04/3 = 37.68m2.

A: The planting area of peony is 37.68 square meters.

Exactly. I made it, um, hehe.