In a square piece of paper with a circumference of 100cm, cut the largest circle. What is the radius of the circle?

A: the radius of this circle is 12.5cm

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1. Kneel down to seek the answers to these calculation questions (1) [3 and 1 / 6 - (7.35-5 and 1 / 12) / / 1.02] / / 1 and 1 / 3 (2) [2 and 1 / 3 + (5.4-2 / 3) × 1 / 3] / / 3 and 4 / 9 (3) 1 / 5 × [(12.25 △ 4 and 1 / 6) × 77%] - 1 and 2 / 3 (4) 6.3 × [(1.4 + 1 / 3) × 1.12-1 / 6] (5) 4.3 × [(3.7-1.5) × 1.25-3] + 1 / 3 (6) 3.6 × [(1.6-2 / 3) × 1.9-7 + 3 / 8] (7) 7 / 5 × [14.8 + (3.7-1.5) × 1.25-3]
2. A square, cut 6cm on one side, cut 2cm on the other side, the remaining rectangle is 68cm2 less than the original square area?
3. Density calculation problem
4. In a rectangle of 12cm long and 5cm wide, draw the largest semicircle. The circumference of the semicircle is () cm and the area is () cm
5. Simplify SiNx + cosx + sinxcosx to get the maximum value
6. Among the 100 natural numbers 1-100, how many can be divisible by 3?
7. Natural number 1.2.3... 100, how many numbers can be taken out at most, so that the sum of any four numbers can be divided by 15 Is the correct answer 6,
8. The maximum number can be taken from natural number 1.2.3.100, so that the sum of any four numbers can be divided by 15 Speed! process
9. How many numbers can be taken out from the natural number 1,2,3,4,5... 100, so that any four of them can be divided by 15?
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15. When x is what value, the following expressions are meaningful in the range of real numbers? 1.√3-X 2. √ 1 / 2x-1
16. When the value of √ x-3 + √ 4-x x is what, the following expressions are meaningful in the range of real numbers
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20. When x is what kind of real number is the following, it makes sense in the range of real number ①√x²+1 Is the root X & # 178; + 1