I only know the diameter of the circle, the diameter is 10CM, how to calculate the maximum square ar

The diameter of the circle is the diagonal of the largest square in this circle, so the side length of the largest square a=10 2=5 2 (cm), so the area of the maximum square in the circle s=5 2 5 2=50 (square centimeters). The square area can also be taken by half of the product of the diagonal, i.e. s = 10 10 2 = 50 (square centimeters).

No matter what the square is, there is only one case, and the diagonal length is equal to the diameter length of the circle.

That is, if the side length of the square is x, then x +x = 10

Because the area of the square is equal to x*x=x, the area is 10 2=50

Let the diameter of the circle be 2b, then the radius is b, and let the side of the square be a, and the diagonal of the largest square in a circle is the diameter of the circle.

This calculates the side a of the square

This can be drawn.

The square of b + the square of b = the square of a.

And the square of a is the area of the square.

So the area of the square is the square meter.

The area of the square is 10 5=50(cm2).

The remaining area is:

Solution: When two diameters are perpendicular to each other, the square with four points connected is the largest.

The area of the square at this point = 10 10 2 = 50 cm

The diagonal of the maximum square is the diameter, so the side of the square is 10*10 divided by 2 roots, and the area = the square of the side of the square, so it is 50

The radius of the circle = 8 2 = 4 (cm).The area of the square:The area of an isosceles right triangle.

32 (square centimeters).

The area formula for a square is:

Area = side length, expressed in letters: s = a (s refers to the area of the square, a refers to the length of the side of the square).

A square is a special rectangle, a special rectangle, and the area of the rectangle = the area of the rectangle = the length and width.

In letters, it is: s=ab (s is the area of the rectangle, a is the length of the rectangle, and b is the width of the rectangle).

The radius of the circle = 8 2 = 4 (cm).

The area of the square:

Isosceles right triangle area 4

32 (square centimeters).

The area of the circle is empty.

The area of the square (10 2) state blind 4=50c

The diagonal length of the circle is equal to the diameter of the circle, that is, the diagonal length of the square = 20cm, the length of the square side hall = 20 2 = 10 2cm, and the area of the square Li Xin = 10 2 10 2 = 200cm.

Simple... The diameter of the circle is 20cm, and the diagonal of the square in the circle is 20cm

With the Pythagorean theorem. 20 = 2x Find x is the side length of the square guess shape.

Then x is the area of the square in the circle.

It is 200cm

Give me the best.,,I'll do the task God Omen.。。

The radius is 6cm

Area = r 2 = 36 is approximately equal to.

The diagonal of the square (two congruent triangles) is multiplied by half of the diagonal of the mausoleum, that is, the diameter of the circle of the Ming Dynasty multiplied by the radius.

The square has a diagonal of 10cm, so the side length is 50

So the area is 5 10 (square centimeters).

The diameter is divided by 2 to get the radius, and the radius multiplied by the half meridian is the area.

s=(d 2) acres

Example: The diameter of a circle is 8 and the radius is 8 2=4

Area: r 2= *4 2 = 16

The diameter is divided by 2 to get the radius, and the radius multiplied by the half meridian is the area.

s=（d÷2）²×

Example: The diameter of a circle is 8 and the radius is 8 2=4

Area: r 2= *4 2 = 16

In a plane, a closed curve formed by a moving point centered on a certain point and rotated around a certain length is called a circle. A circle has an infinite number of dots.

The set of points in the same plane whose distance to a fixed point is equal to a fixed length is called a circle. A circle can be represented as a set, and the standard equation for a circle is (x - a) y - b) = r. where o is the center of the circle and r is the radius.

A circle is a conic curve that is obtained by a planar truncated cone parallel to the bottom surface of the cone.

If you know how to calculate the area of a circle by the diameter of a circle, children who don't know how to come and learn.

The formula for the area of a circle is the square of pi * radius, which can be expressed by letters as: s= r or s= *(d 2). for pi, r for radius, d for diameter).

Divide the diameter by two to get the radius, and then use the formula s=r, i.e. the area is equal to the square of the multiplied radius.

Multiply the pi by the diameter and you're good to go! Pi is generally calculated by multiplying the diameter by the area of the circle!

The area is equal to the radius multiplied by pi.