Circumference length 3.5 dm. What is the length of the second circle, which has a diameter

Circumference length 3.5 dm. What is the length of the second circle, which has a diameter of five-sevenths of the diameter of the first circle?

To solve this problem, you first need to determine the diameter of the first circle.

For this we use the following formula:

C = п * d,
Where:

C – circumference (3.5 dm).

п is a constant value (3.14).

d is the diameter of the circle.

We express the diameter from the formula:

d = C / п.

Substitute the values into the formula.

d = 3.5 / 3.14 = 1.1146 dm.

Find the diameter of the second circle.

1.1146 * 5/7 = 5.5732 / 7 = 0.7961 dm.

So the length of the second circle will be equal to:

C = 3.14 * 0.7961 = 2.5 dm.

Answer: Circumference 2.5 dm.