Question

Длина окружности 3,5 дм. Чему равна длина второй окружности, у которой диаметр составляет 5/7 диаметр первой окружности?

Answer 1

1)3,5:7*5=2,5 дм диаметр второй окружности
2)2,5*3,14=7,85 дм длина второй окружности

Answer 2

3,5:7=0,5
0,5×5=2,5дм

2,5×3,14=7.85дм

ответ: длинна второго 7.85 дм

Answer 3

Calculating the Length of the Second Circle's Circumference

To find the length of the second circle's circumference, given that its diameter is 5/7 of the diameter of the first circle, we can use the formula for the circumference of a circle: C = πd, where C is the circumference and d is the diameter.

The diameter of the first circle is not explicitly given, but we know the circumference is 3.5 dm. We can use this information to find the diameter of the first circle.

Finding the Diameter of the First Circle

The formula for the circumference of a circle is C = πd. We can rearrange this formula to solve for the diameter d: d = C / π

Using the given circumference of the first circle (3.5 dm), we can calculate the diameter of the first circle: d = 3.5 / π

Calculating the Diameter of the Second Circle

Given that the diameter of the second circle is 5/7 of the diameter of the first circle, we can calculate the diameter of the second circle: d2 = (5/7) * d1

Substituting the value of d1 we calculated earlier: d2 = (5/7) * (3.5 / π)

Calculating the Circumference of the Second Circle

Now that we have the diameter of the second circle, we can calculate its circumference using the formula C = πd: C2 = π * d2

Substituting the value of d2: C2 = π * (5/7) * (3.5 / π)

Solving this equation will give us the circumference of the second circle.

Conclusion

By following these steps, we can calculate the length of the second circle's circumference based on the given information.