Input the radius and write the program to calculate the area and perimeter of the circle with VB In order to ensure the correct operation of the program, the input radius is checked legally. The IsNumeric function is called to check the data. The msgbox is used to first send the error message, and the result is reserved for two decimal places. The area and perimeter are required to be completed by two commands. The radius is controlled by a label

Input the radius and write the program to calculate the area and perimeter of the circle with VB In order to ensure the correct operation of the program, the input radius is checked legally. The IsNumeric function is called to check the data. The msgbox is used to first send the error message, and the result is reserved for two decimal places. The area and perimeter are required to be completed by two commands. The radius is controlled by a label

Private Sub Command1_ Click()
Dim bj As Single
Dim zz As Single
Dim mj As Single
bj = CSng(Text1.Text)
If bj

If you know the area of a circle, what is the diameter

Area △ 3.14 × 4 = diameter × diameter
You can get the area △ 3.14 × 4
Then see which number multiplies itself
For example, 25, 25 = 5 × 5, and the diameter is 5
36, 0.36 = 0.6 × 0.6, and the diameter is 0.6

How to calculate the area of a circle with a radius of 8 cm

S = 3.14 * 8 * 8 = 200.96 square centimeter

How to calculate the area of a circle with a diameter of 4cm and a radius of 2cm

S=πR²
Area = 2 * 2 * 3.14 = 12.56 square centimeter

If π is 10 times smaller (0.31415926 ''), how many times smaller is the circle area calculated by π?
Hope to be accurate to 60 trillion decimal places

The calculated circle area is 10 times smaller, and the circle area = π RR,

How to calculate the area of a circle with a diameter of 3 inches?

The formula for calculating the area of a circle is: the square of the radius times the circumference (3.14.)
The formula for calculating the area of a circle is: π R & # 178;, which is the ratio of the circumference times the square of the radius
3 inches in diameter = 10 cm, so the radius is 10 / 2 = 5 cm
Area: 5 x 5 x 3.14 = 78.5 (square centimeter)

Some formulas for calculating the area and circumference of a circle
Circle area formula, circle length formula, sector formula, crescent formula, kite formula, leaf formula

Calculation formula of circle area: radius · radius · π R · R · 3.14
Calculation formula of circumference length: diameter · π D · D · 3.14

What is the formula for calculating the area of a circle? Is it the square of the radius of the circumference x? I don't know what the square of the radius means? How to calculate it?
Which great Xia helps to calculate the area of a circular object with a radius of 150 mm. How much is it if it is priced at 500 square meters?

For example, the square of 4 is equal to 4 × 4 = 16, the area of the circle is equal to the square of the radius multiplied by π, π = 3.14, so you can calculate it by yourself. Pay attention to whether the unit is 500 square millimeter or square centimeter or square meter. If it is millimeter, calculate it directly. If it is centimeter or meter, convert the half diameter to the corresponding unit

When deducing the area formula of a circle, the circle is divided into several equal parts and put together into an approximate rectangle. It is known that the area of a circle is 6.42cm longer than the width?

As long as you understand one thing, you can calculate it: the width of the rectangle is the radius of the previous circle, and the length of the rectangle is half of the circumference of the previous circle. π R-R = 6.42, the solution is r = 3cm, the area of the circle s = π R2 = 9, π = 28.26cm2

When deducing the area formula of a circle, the circle is divided into several equal parts to form an approximate rectangle. It is known that the length of the rectangle is 6.42cm more than the width, and the area of the circle is smaller
It's () square centimeter

The width of the rectangle is the radius and the length is π R
πr-r=6.42
r=3cm
The area is 28.26 square centimeters