How to find the radius of a circle?
How to find the radius of a circle?

If the circumference is known, the radius of the circle 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 circleyou can find.
If we know the diameter of a circle, then we can divide it into two. This produces the radius of the circle.
Well in this calculation helps the formulaR = L / 2.
Ris the radius.L the length of the circle (if known or can be determined).2 2 * 3,14.

Divide the diameter of the circle by 2
This will be the radius !!!

If this should be done in an experimental way and without the help of all formulas, then it is easier to take a ruler and measure the diameter of this circle, and then, respectively, divide it into two, so you get a radius. Why is it better to measure the diameter? Yes, so that the center of the circle does not look)))

It depends on the source data. If the diameter is known, then simply divide by 2, if there is a circumference, then divide it by the number Pi times 2. If there is a focal plane, you should divide it by the number Pi and extract the square root from the resulting number, this will be the radius. Well, or measure with a ruler if there is a circle itself.

Find the radius of a circleIt is usually required when the circumference is known. In this case, to find the radius of the circle, you just need to divide the length of the circle by 6,28. This will be the radius.
It's not so easy to find the radius, when there is a circle, but there is nothing but a ruler. It is clear that the radius is half the diameter, but how to draw a diameter, if there is no center?
Very simple. Choose three points on the circle, draw an inscribed triangle. Next, we draw three perpendiculars from the centers of the sides of the triangle. Their point of intersection will be the center of the circle. Next, measure the distance from the center of the circle to the circumference.This is 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 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 the circle is known, then by the formula S = R, hence R = (S /).

Radius a segment that connects 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 task, on what kind of source data you have.
For example:
1) R = 0,5D. Here D is the diameter of the circle.
2) Using a ruler, you can measure the diameter, and then divide the resulting number into 2.
3) If the circumference of C is known, then 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 in a square, you can find the radius of a given circle by the value of the square 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 length of the circle is L, P is the quot ;, equals 3,14.

This is the distance from the center of the circle to one of the e extreme points. That is the simplest line. It is easier and more accurate to measure the diameter  we divide it in half. If the length of the circle C is given, then r = C / 2 * П.

Take a ruler and measure it. From center to circle.
Or are you interested in the analytical method?
Usually, the circle is set as follows: quot; given a circle with radius Rquot ;, so here's quot; Rquot; this is the radius.
If instead of quot; Rquot; quot; Dquot ;, this diameter is twice the 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.
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