Find the area of a circle whose radius is 10 dm.

Answer: the area of the circle will be equal to 314 dm².
The area of a circle through the value of its radius is calculated by the formula:
S = πR², where:
π – number “pi” – a mathematical constant equal to the ratio of the circumference of a circle to its diameter. In normal calculations, it is taken equal to 3.14.
S is the required area of the circle;
R is the radius of the circle;
Let’s calculate the area of a circle:
S = 3.14 * 10 ^ 2 = 3.14 * 10 * 10 = 314 dm².
This is an approximation, since the infinite pi has been rounded to the nearest hundredth.