After one third of a rope is subtracted, there is still 12.56 decimeters left. If the subtracted rope is enclosed into a circle, how many square decimeters is the area of the circle?

After one third of a rope is subtracted, there is still 12.56 decimeters left. If the subtracted rope is enclosed into a circle, how many square decimeters is the area of the circle?

Perimeter = 12.56 ÷ (1-1 / 3) = 18.84 decimeters
Radius = 18.84 △ 3.14 △ 2 = 3 decimeters
Area = 3 × 3 × 3.14 = 28.26 square decimeters

There are two ropes, one is 48 meters long, and the other is 56 meters long. We should divide these two ropes of the same length into two small sections. There is no surplus. How long is each section? How many meters can we cut them
There are two ropes, one is 48 meters long and the other is 56 meters long. The two ropes of the same length should be divided into two small sections. There should be no surplus. How long is each section? How many sections can be cut?

48＝8x6
56=8x7
The greatest common divisor is 8
So each segment is 8m long
We can make 6 + 7 = 13

A and B are two ropes. Rope a is 56 meters long and rope B is 25 meters long. After the two ropes are cut to the same length, the remaining length of rope a is three times that of rope B, which is one meter less. How many meters is the length of each rope cut?

Let's cut each rope by X meters, the remaining length of rope a is (56-x) meters, and the remaining length of rope B is (25-x) meters