How to draw the radius of a circle with an area of 3

I don't know if you want to draw it with a compass or calculate it.

But the method is the same. If you just draw it, the radius is an approximation.

Let's start with an equilateral triangle. Lengthens to a

Draw any 2 sides high, and the intersection point is the center of the circle (that is, the intersection of the bisector of the 2 vertex corners).

One height and 2 sides form a 30°+60° right triangle, while the second high divides this height into a small 30°+60° right triangle and an isosceles triangle. According to this theorem of the side length of a right triangle, the radius is ( 3a 2-a 2 3) according to the formula for the area of the circle r2 (squared) = 3, and a = 3 is approximately equal to; Then the radius is: 3 and equal to .

That is, first draw an equilateral triangle with an edge length of about one, find the center of the circle according to the above method, and use the distance from the center of the circle to one of the top corners as the radius. Draw a circle, and the area is about 3

1. Take any two points A and B on the perimeter of the circle with an area of 3 (hereinafter referred to as 3 circles) and connect them as a perpendicular line. The diameter is the intersection of 3 circles and two points. Repeat the above to obtain the center of the circle.

2. Take A and B as the center of the circle and make equal circles intersect and connect them as the diameter. The center of the circle is as above.

Lots of ways.

Divide the circle into threes, and then connect these three points, you will get an equilateral triangle, and then make the angular bisector of the three corners, the intersection point is the center of the circle, and the radius will be there! ok ？

The area of the circleThe formula is:PiMultiply by the square of the radius, which can be expressed in letters as: s= r or s= *d2).

s is the area of the circle, which is the pi, r is the radius, and d is the diameter).

Derivation of the formula: circumference of a circle.

c): The diameter of the circle (d), the circumference of the circle (c) divided by the diameter of the circle (d) is equal to , then the meaning of multiplication is equal to the diameter of the multiplication circle (d) is equal to the circumference of the circle (c), c = d. The diameter of the circle (d) is twice the radius of the circle (r), so the circumference of the circle (c) is equal to 2 times times the radius of the circle (r), c = 2 r.

By dividing the circle into equal parts, you can put together an approximate rectangle. The width of the rectangle is equal to the radius of the circle (r), and the length of the rectangle is half the circumference of the circle (c). The area of the rectangle is ab, and the area of the circle is:

The square of the radius (r) of the circle is multiplied by , s= r.

1. How many times is the radius of a circle, and the diameter and circumference are also expanded or reduced by the same multiple. And the multiple of the area enlargement or contraction is the square of this multiple.

2. When the circumference of the rectangle, square, and segment silver circle is equal, the area of the circle.

Largest, the square is centered and the rectangle is the smallest. Conversely, when the area is the same, the circumference of the rectangle is the longest, the square is centered, and the circumference of the circle is the shortest.

Let the radius of the circle be r, and the formula for the area of the circle is r.

Known: the radius r of the circle, find the area of the circle s?

Circle area s = 丌r 2

The area of the circleThe formula Pei and Yu S shed noise r, the half-matched rolling diameter is 3, so the area of the circle is 9.

Draw a round like a crack under the grandson:

The circumference of this circle is: 2 cm);

The area is: 2

square centimeter m);

Answer: The circumference of this circle is centimeters, and the area is square centimeters of the flat stove chain

How to draw a circle with a radius of 3 cm! Hello, happy to answer your <>

The method of drawing a circle with a radius of 3 cm is to draw a circle with a radius of 3 cm with Photoshop The steps are as follows: 1. Open the Photoshop software and create a new [canvas], here select the A4 size as an example; 2. Click [Marquee Tool] in the toolbar on the left, and then select [Ellipse Marquee Tool]. 3. In the toolbar above, click on the style to select [Fixed Size], set [Width] to 6 cm, and set [Height] to 6 cm (the diameter is 2 times the radius, so it is set to 6 cm, and the width and height are the same. 4. Click anywhere on the canvas and a circle with a radius of 3 cm will appear; 5. This is done, you can change the color of the circle according to your needs. Expand the information, I hope mine can help you [Kaipai Yuanxin]!

Do you have any other questions?

square centimeters).

Answer: The radius is three centimeters, and the area of the collapse circle is square centimeters.

, square centimeters of He Sui rice), late bend.

Answer: The area of a circle is a square yard of muffled centimeters

The area of the circle Radius Radius.

Radius Circumference 2

or Radius diameter 2

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 axes of symmetry.

The area formula for a circle.

A circle is cut along the diameter, divided into several parts, and put together into an approximate rectangle, the length of the rectangle is equivalent to half of the circumference of the circle (half of the c) and the width is equivalent to the radius of the circle (r).

Because: the area of the rectangle = length x width = the area of the circle.

So: the area of the circle = length x width = 2 c = the square of the vultures.

The formula is: the square of the vultures.

The first product of the surface hole is the area of the circle with a radius of 3 and the area of the mountain 3 is only 4, and its area is =3 3.