Find the area of 5/7 of a circle if its radius is 2.8 m

First, you need to calculate the area of the entire circle with a radius of 2.8 m.

The area of a circle is equal to the product of the number п = 3.1 and the diameter of the circle or twice the radius:

S = п * D = п * 2R.

Thus, the area with a given radius is

S = 3.1 * 2 * 2.8 = 17.36 (m ^ 2).

The area of a 5/7 circle, respectively, is

s = 5/7 S = 5/7 * 17.36 = 12.4 (m ^ 2).

Answer: The area of a 5/7 circle with a radius of 2.8 m is 12.4 m ^ 2.