The perimeter of a circular fountain is 12.56 meters. What is the area of the fountain? If the fountain is surrounded by a circular green belt with a width of 1 meter, what is the area of the green belt?

The perimeter of a circular fountain is 12.56 meters. What is the area of the fountain? If the fountain is surrounded by a circular green belt with a width of 1 meter, what is the area of the green belt?

Inner radius 12.56 △ 3.14 △ 2 = 2m
Outer radius 2 + 1 = 3M
Area 3.14 × (3 × 3-2 × 2) = 3.14 × 5 = 15.7 square meters

The diameter of a circular fountain is 12 meters. How many meters is its perimeter?

14 × 12 = 37.68 (m); answer: perimeter is 37.68 M

A circular fountain, the perimeter is 28.26 meters. How many square meters is its area?
What's the formula

28.26/3.14/2=4.5(m) 4.5*4.5*3.14=63.585(m)2

The diameter of the circular spray is 4 M. around it, a circular road with a width of 1 m is built. How many square meters is the area of the road? To make it clear, I have additional rewards

4×3.14=12.56（cm)
12.56 × 1 = 12.56 (M2)

The radius of a circular fountain is 2 meters. How many meters is the diameter? Grandfather Zhang walks around the fountain for 2 times. How many meters is the area of the circular fountain

4 meters in diameter

The diameter of the circular fountain in the community is 12.5 meters. Aunt Wang walks around the fountain eight times every day after dinner. How many meters has she walked?

Perimeter = 12.5 π M
Aunt Wang walked 12.5 π X8 = 100 π M = 314 M

A park is round. My grandfather takes a walk around the park. It's 628 no, the average step is 0.5 meters. What's the area of the park?

628 * 0.5 / (2 * 3.14) = 50 (m)
3.14 * 50 * 50 = 7850 (M2)
A: the park covers an area of 7850 square meters
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The diameter of a circular fountain is 6 meters. A 2-meter-wide path is built around the fountain. How many square meters does the path cover? How many square meters
The diameter of a circular fountain is 6 meters. A 2-meter-wide path is built around the fountain. How many square meters does the path cover?

What is the radius of the fountain
6 △ 2 = 3 (m)
What is the outer radius of the path
2 + 3 M
What is the floor area of the path
5 × 5 × 3.14-3 × 3.14 = 50.24 (M2)

The area of a circular fountain is 78.5 square meters. Try to find the radius π of the fountain to be 3.14

78.5÷3.14=25=5×5
The radius is 5 meters

A round fountain with a diameter of 8 meters covers an area of () square meters
Divide a circle equally into several parts along its radius, and then put it together into an approximate rectangle. The circumference of the rectangle is 4cm longer than that of the circle. The area of the circle is ()
In the afternoon,

8/2=4,
3.14 * 4 & # 178; = 50.24 (M2)
A round fountain with a diameter of 8 meters covers an area of (50.24) square meters
Radius of circle: 4 / 2 = 2 (CM)
Area of circle: 3.14 * 2 & # 178; = 12.56 (square centimeter)