Question

Окружность арены во всех цирках мира имеет длину 40.8 м . найдите диаметр и площадь арены (П = 3) .

Answer 1

C=пи*D
S=Пи * D²/4
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D=40.8/3=13.6
S=138.72

Answer 2

Finding the Diameter and Area of the Arena

To find the diameter and area of the arena, we can use the given circumference and the value of π.

Circumference of the Arena: The circumference of the arena is given as 40.8 meters, and the value of π is 3.

Finding the Diameter: The formula for the circumference of a circle is C = πd, where C is the circumference and d is the diameter. We can rearrange this formula to solve for the diameter: d = C / π.

Using the given circumference and the value of π: d = 40.8 / 3 = 13.6 meters.

Finding the Area: The formula for the area of a circle is A = πr^2, where A is the area and r is the radius. Since we have the diameter, we can find the radius using the formula r = d / 2. Then, we can calculate the area using the formula A = πr^2.

First, we find the radius: r = d / 2 = 13.6 / 2 = 6.8 meters.

Now, we can calculate the area: A = πr^2 = 3 * 6.8^2 = 138.72 square meters

Therefore, the diameter of the arena is 13.6 meters, and the area of the arena is 138.72 square meters.