# How to find the radius of a circle?

How to find the radius of a circle?

If the circumference is known, then the radius of the circumference can be found by dividing its length by two pi. Formula: C = 2 * pi * R, whence R = C / (2 * pi). C is the circumference, R is the radius of the circle …………………… ..

**Radius of a circle**can be found.If we know the diameter of the circle, then we can divide it into two. Get the radius of the circle.

Not bad in this calculation helps formula

**R = L / 2.****R**- radius.**L**- the length of the circle (if known or can be determined).**2**- 2 * 3,14.Divide the circle diameter by 2

This will be the radius !!!

If it is necessary to do this experimentally and without the help of all sorts of formulas, then it is easier for the easy to take a ruler and measure the diameter of this circle, and then, respectively, divide it into two, and that’s the radius. Why is it better to measure the diameter? Yes, not to look for the center of the circle)))

It depends on what the source data is. If the diameter is known, then simply divide by 2, if there is a circumference, then divide it by Pi multiplied by 2. If there is an area around the circle, then it should be divided by the number Pi and extract the square root from the number obtained, this will be the radius. Well, or measure with a ruler, if there is a circle itself.

**Find the radius of the circle**usually required when the circumference is known. In this case, to find the radius of the circle, you just need to divide the circumference by 6,28. This will be the radius.**Not easy to find radius**when there is a circle, but there is nothing but a ruler. It is clear that the radius is equal to half the diameter, but how to draw the diameter if there is no center?Very simple. Select three points on the circle, draw the inscribed triangle. Next, we draw three perpendiculars from the centers of the sides of the triangle. Their intersection point will be the center of the circle. Next, measure the distance from the center of the circle to the circle itself.

**This will be the radius of the circle.**There are several ways to find the radius of a circle:

**1.**If the circle is built on a regular sheet, then measure the e radius with a ruler.**2.**If the diameter of the circle is known, then it is necessary to divide the diameter in half.**3.**If the area of a circle is known, then by the formula S = R, hence R = (S /).**Radius**- the segment connecting the center of the circle and any point that is marked on it.There are quite a few ways to find the radius of a circle. It depends on the conditions of the problem, on what kind of initial data you have.

**For example:**1) R = 0,5D. Here D is the diameter of the circle.

2) Using the ruler, you can measure the diameter, and then divide the resulting number by 2.

3) If the length of the circle C is known, then the value R = C / 2.

4) If the area of the circle A is known, then the value R = Root (A).

5) If the circle is inscribed square, then you can find the radius of this circle by the value of the area of the square and the length of its side.

The easiest way to find the radius of a circle is the diameter of this circle, if, of course, it is known, divided by 2. Here is the formula R = D / 2.

If the circumference is known, then the following formula can be used: R = L / 2P (the circumference is L, P is quot; piquot ;, equal to 3,14.

This is the distance from the center of the circle to one of the e extreme points. That is, the easiest way to ruler. It’s easier and more accurate to measure the diameter - divide in half. If circumference C is given, then r = C / 2 * P.

Take a ruler and measure. From the center to the circle.

Or are you interested in the analytical method?

Usually, a circle is set like this: quot; a circle with a radius Rquot; is defined, so here quot; Rquot; this is the radius.

If instead of quot; Rquot; it says quot; Dquot ;, then this diameter is doubled radius.

The radius of the circle can be found in the following ways:

- If you measure the distance from the center of the circle to one of the e extreme points.
- If the diameter of the circle is known, then R = D / 2.
- If the circumference is known, then R = C / 2 * 3,14.