Find the area of a circle whose diameter is 12 cm. Find the area of a circle whose diameter is 2 times less than

Find the area of a circle whose diameter is 12 cm. Find the area of a circle whose diameter is 2 times less than the diameter of the first circle.

The problem is solved by the formula for finding the area of a circle.
S = пr ^ 2
P = 3.14
To find the radius, let’s use the fact that the diameter is the radius multiplied by 2. That is, the radius = 12: 2 = 6cm
Now we just plug the data into the formula and solve.
3.14 * 6 ^ 2 = 113.04cm ^ 2 – S 1 circle.
If the diameter of the second circle is two times smaller, then the radius will be two times smaller. We get a new radius: 6: 2 = 3cm
We plug the data into the formula and solve.
3.14 * 3 ^ 2 = 28.26cm ^ 2
Answer: S1cr. = 113.04cm ^ 2, S2cr. = 28.26cm ^ 2.