The radii of the two concentrates of the Czech circle are equal to 2 and 5. How does the area of the ring

The radii of the two concentrates of the Czech circle are equal to 2 and 5. How does the area of the ring relate to the area of the great circle?

First, let’s find the areas of these two circles.

In the initial data for this task, it is reported that the radius of the smaller circle is 2, and the radius of the larger circle is 5.

Using the formula for the area of a circle, we find the area s1 of the smaller circle and the area S2 of the larger circle:

s1 = n * 2 ^ 2 = n * 4 = 4n;

S2 = n * 5 ^ 5 = n * 25 = 25p.

We find the area of the ring, as the difference between the areas of the larger and smaller circles:

S2 – s1 = 25p – 4p = 21p.

We find the ratio of the area of the ring to the area of the great circle:

21p / (25p) = 21/25.

Answer: 21/25.