# What is the scope of NET 2

## Circle calculation: area, radius, diameter, circumference - all formulas

This article is about the topic **Circle calculation**. Basically this is very simple, you just have to know a few formulas and it'll all work by itself. We're going to introduce you to a few equations so that you can see the relationships between **Radius, area, diameter** and understand scope better. The **Circle calculation** belongs to mathematics.

Now let's take a look at a few facts about the **Circle calculation** at.

### Examples and formulas in the **Circle calculation**

First there is that **radius** one **Circle**. The **radius** gives the straight distance from the center of the circle to the edge of the circle. According to that is the **twice the radius, logically, the diameter of the circle**.

### Diameter = 2 x radius

To illustrate this again in numbers. If the **radius** of a circle is 3 meters, then that is **diameter** 6 meters.

The number π (Pi) is also required. This is usually given in schools as 3.14159. Actually, however, this number has an infinite number of descendants, since after the largest there is always a larger one and below the smallest there is always something smaller, at least if you calculate the circumference of a circle.

### Radius, area and the diameter in the circle calculation

Let's start with calculating the area of a circle. Here are the formulas:

### Area = Pi times the radius squared.

**Area = Pi times the diameter squared divided by 4.**

So stands **A.** for the **surface**, **π** for the district number 3.14159, **r** for the **radius** and **d** for the **diameter**. It is important that for area, radius and **diameter** the same unit of measurement is used in the formula.

### Example for the area calculation

We have a circle with that **radius** from 0.34 meters. With the formulas listed above, we will now use the **surface** To calculate. To do this, we just have to use the values known to us. So here we calculate using the radius:

And here we calculate using the diameter:

So you see, it's very simple.

### Example of calculating the radius of a circle

We have a **surface** in the size of 1.2m ^ 2. What is the measure now **radius**?

To do this, we simply have to rearrange the formula and use the values known to us, i.e. the **surface** and the number pi.

So simply rearrange A = π x r ^ 2 so that the value you are looking for is on its own. Anyone who has done this a few times has mastered it in their sleep.

### Example of calculating the circumference of a circle

Here we need a new formula, namely:

The value **U** stands for **scope**. The meaning of the other abbreviations has already been explained and should be known.

So here is an example of how to calculate the **Circumference** of a circle.

A circle has one **radius** of 5 meters, what is the circumference?

This can of course also be done via the **diameter** calculate.

### Test your knowledge with our quiz on the subject of circle calculation!

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