Question

Диаметр окружности равен 9 (П=3). a) Найдите длину окружности. b) Найдите площадь круга. срочно!! ​

Answer 1

Ответ:

Длина окружности (C) вычисляется по формуле C = π * d, где d - диаметр. В данном случае, если диаметр равен 9, то длина окружности равна 9π.

b) Площадь круга (S) вычисляется по формуле S = π * r^2, где r - радиус. Для нахождения площади, нужно знать радиус. Радиус (r) равен половине диаметра, то есть r = 9 / 2.

Теперь можно подставить значения в формулу для площади: S = π * (9 / 2)^2.

Answer 2

Calculation of Circumference and Area of a Circle

To find the circumference and area of a circle, we need to know the diameter of the circle. In this case, the diameter of the circle is given as 9 units.

a) Finding the Circumference of the Circle: The circumference of a circle can be calculated using the formula: C = π * d, where C is the circumference and d is the diameter of the circle.

Substituting the given diameter of 9 units into the formula, we get: C = π * 9

To find the value of π, we can use the approximation 3.14.

C = 3.14 * 9 = 28.26

Therefore, the length of the circumference of the circle is approximately 28.26 units.

b) Finding the Area of the Circle: The area of a circle can be calculated using the formula: A = π * r^2, where A is the area and r is the radius of the circle.

Since the diameter is given, we can find the radius by dividing the diameter by 2: r = d/2 = 9/2 = 4.5 units

Substituting the radius into the formula, we get: A = π * (4.5)^2

A = 3.14 * 20.25 = 63.585

Therefore, the area of the circle is approximately 63.585 square units.

Please note that the values of π and the resulting calculations are approximations.

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