Math genius please come in, math genius, come in

As long as the question about the circle is to pay attention to the formula about pi:

Circumference of a circle: c d = 2 r d is the diameter and r is the radius.

Circle area: S r 2

The relevant questions are as follows:

Knowing that the radius of the circle is 1, find the area of the circle;

Knowing that the radius of the circle is 1, find the circumference of the circle;

A circular flower bed with a circumference of 314 meters, find the diameter and radius of the flower bed;

It is known that a semicircular flowerbed with a circumference of 414 meters is known, and the diameter and radius of the flowerbed are found.

Pi: is an infinite non-cyclic decimal. Valid values:

Circumference of a circle: c d = 2 r d is the diameter and r is the radius.

Circle area: S r 2

As the question: Knowing that the diameter of a circle is 2, find its circumference and area.

c ＝ d =

s＝ πr^2 = * 2/1)^2 =

Practice makes perfect, remember the formula, as long as there are parameters such as diameter, radius, etc., it is easy to solve.

Pi is a fixed ratio of the circumference of a circle to its diameter. If the radius of a circle is one, then its circumference is:

c=2πr =2*

It is enough to master the above, and the rest can be easily solved.

Pi. This was sought by the ancients. We don't know. Anyway. You remember, inside the math. Pi is about equal to that.

I want to find the area. Pi x radius squared. It depends on the number listed in the question. Just bring in the formula.

Circumference. Pi x diameter. Look at the diameter given in the question. Just use the number given in the title. Just bring in the formula. .I don't understand that.

Remember. .These numbers are often used.

For questions about pi, just apply the formula. If you're in elementary school, that's fine. Example: It takes 4 minutes to walk around a circular flower bed, and it is known that you walk 314 meters per minute, find the radius of this flower bed.

It's interesting to think about the questions for yourself. Let's not talk about the process. If you really can't, a reminder:

To find the radius is to find the diameter first, to find the diameter is to find the circumference of this flowerbed, the perimeter of this flowerbed... Think for yourself. Quite simply, the final answer is 200 meters.

That's a lot of math geniuses.

Solution: Let's say they all share x sheets.

By the inscription: x<(26-x) 2<26 2

then x<<13

Then the maximum value range of x is 12 (because it is less than half of the total number of 13 cards), so (why is your question so weird?) Do you ask A or B? ）

The following three paragraphs are purely analysis, and lz picks the appropriate answer by himself) If it is A, then it can only be said to be 3 according to the title. (Unless you make a mistake) if it's B, then use 12-3=9 sheets.

If you ask them how many they use at most, it's 12.

3+x<(26-3-x) 2 gets 3x<17 B uses up to 5 cards.