Question

7. Диаметр окружности равен 8 (1-3). а) Найдите длину окружности. Б) Найдите площадь круга. СРОЧНО

Answer 1

Ответ:

Б) найти длину окружности.

Answer 2

Calculation of the Circumference of a Circle

To find the circumference of a circle, we need to know the diameter. In this case, the diameter of the circle is given as 8(1-3). Let's calculate the circumference.

The formula to calculate the circumference of a circle is:

Circumference = π * Diameter

where π (pi) is a mathematical constant approximately equal to 3.14159.

Given that the diameter of the circle is 8(1-3), we can substitute this value into the formula:

Circumference = π * (8(1-3))

Simplifying the expression inside the parentheses:

Circumference = π * (8 * -2)

Circumference = π * (-16)

Now, let's calculate the approximate value of the circumference using the value of π as 3.14159:

Circumference ≈ 3.14159 * (-16)

Circumference ≈ -50.26544

Therefore, the length of the circumference of the given circle is approximately -50.26544.

Calculation of the Area of a Circle

To find the area of a circle, we also need to know the diameter. Let's calculate the area of the circle using the given diameter of 8(1-3).

The formula to calculate the area of a circle is:

Area = π * (Radius)^2

where the radius is half the diameter.

Given that the diameter of the circle is 8(1-3), we can substitute this value into the formula:

Radius = (8(1-3))/2

Simplifying the expression inside the parentheses:

Radius = (8 * -2)/2

Radius = -8

Now, let's calculate the approximate value of the area using the value of π as 3.14159:

Area ≈ 3.14159 * (-8)^2

Area ≈ 3.14159 * 64

Area ≈ 201.06176

Therefore, the area of the given circle is approximately 201.06176.

Please note that the negative sign in the circumference value might indicate an error in the given diameter. It is unusual to have a negative circumference or area for a circle.