The circumference of a circle is the same as that of a square. The side length of the square is 6.28 cm. What is the area of the circle?

6.28×4÷3.14÷2，
=6.28×4÷6.28，
=4 (CM),
So the area of the circle is 3.14 × 42 = 50.24 (square centimeter);
A: the area of the circle is 50.24 square centimeters

Draw a square with a side length of 4cm. Then draw the largest circle in the square and find the circumference and area of the circle

The drawing is as follows:
Known side length = diameter = 4cm, radius = 2cm;
C=πd
=3.14×4，
=56 (CM);
S=πr2
=3.14×22
=3.14×4，
=56 (square centimeter);
A: the circumference of the circle is 12.56 cm and the area is 12.56 cm 2

The following four quantities of a circle are: 1. The circumference of the circle when the radius changes; 2. The area of the circle when the radius changes; 3. The circumference ratio when the radius changes; 4. The area when the circumference changes. The number of variables is ()

The following four quantities of a circle are: 1. The circumference of the circle when the radius changes; 2. The area of the circle when the radius changes; 3. The circumference ratio when the radius changes; 4. The area when the circumference changes. The number of variables is (3)
If there is anything you don't understand, you can ask,

The ratio of the circumference of a circle to the ratio of its () is 1. Radius 2. Diameter 3. Circumference

PI is the ratio of the circumference of a circle to its ratio (2: diameter). 1. Radius 2. Diameter 3. Circumference

Judgment: Pi is the ratio of the circumference of a circle to its diameter

correct

If the diameter of a circle is fixed, the circumference is related to the ratio of circumference to circumference A. Positive proportion B. In inverse proportion C. Out of proportion

Because the circumference of the circle C = π D,
In this question, the diameter of the circle is fixed, and the circumference ratio is also certain,
So the perimeter is also certain,
In other words, the three quantities are all fixed, and there is no problem of variable,
Therefore, the circumference of a circle is not proportional to its ratio;
Therefore, C

The circumference of a circle and the diameter of a circle () are called PI Is it ratio or ratio?

The ratio of circumference to diameter of a circle is called PI

PI is the ratio of () to () of a circle. It is a decimal of () and 3.14 is its (), usually represented by the letter ()

PI is the ratio of the circumference to the diameter of a circle. It is a decimal (infinitely acyclic), and 3.14 is its approximate value. It is usually expressed by the letter (π)

PI is zero And The ratio, in letters To reserve two decimal places is about .

PI is the ratio of circumference to diameter of a circle, expressed by the letter π, with two decimal places about 3.14;
So the answer is: circumference, diameter, π, 3.14

PI is the ratio of () to (), which is expressed by the letter (), with two decimal places reserved, which is about (),

PI is the ratio of (circumference) to (diameter), expressed by letter (π), with two decimal places about (3.14), hurry up

The circumference of a circle is the same as that of a square. The side length of the square is 6.28 cm. What is the area of the circle?