Question

Найдите площадь 2/9 круга, радиус которого 8,1 см. (Число округлите до десятых)

Answer 1

S=πR²

π=3,14=3,1

S=3,1•8,1•8,1=203,4

S 2/9 круга=203,4•2/9=45,2см

Answer 2

Calculation of the Area of a Circle

To find the area of a circle, we can use the formula:

Area = π * r^2

where π (pi) is a mathematical constant approximately equal to 3.14159, and r is the radius of the circle.

In this case, the radius of the circle is given as 8.1 cm. So, we can substitute this value into the formula to calculate the area.

Area = π * (8.1 cm)^2

Let's calculate the area using the given radius.

Calculation:

Area = 3.14159 * (8.1 cm)^2

Area ≈ 207.264 cm^2

Therefore, the approximate area of the circle with a radius of 8.1 cm is 207.264 square centimeters.

Please note that the area is rounded to the nearest tenth.