Divide five seventh of a meter into five parts equally. What's the percentage of each part? How many meters is each part?

Divide five seventh of a meter into five parts equally. What's the percentage of each part? How many meters is each part?

5 / 7 △ 5 = 1 / 7 (m)
1÷5=1/5
A: one fifth of it, one seventh of it

It is known that the radius ratio of the two circles is 5:3, and the circumference difference of the two circles is 12.56 decimeters. Find the diameter of the two circles

It is known that the radius ratio of the two circles is 5:3, and the circumference difference of the two circles is 12.56 decimeters. Find the diameter of the two circles
The diameter of the big circle is 12.56 △ 3.14 △ (5-3) × 5
=4÷2×5
=10 decimeters
Small circle diameter 10 × 3 / 5 = 6dm

The circumference of the circle increases from 5 π to 8 π, and its radius increases______ ．

(8 π - 5 π) △ 2 π = 3 π △ 2 π, = 1.5 π. A: its radius is increased by 1.5 π. So the answer is: 1.5 π