# Cara Menghitung Diameter Lingkaran

>Hello Sohib EditorOnline, welcome to this article on how to calculate the diameter of a circle. This article will guide you step by step on how to calculate the diameter of a circle using different formulas and methods. You will also learn more about the circle and its properties. Let’s get started!

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## The Circle

A circle is a geometric shape that is defined as a set of points that are equidistant from a central point. The distance from any point on the circle to the center point is called the radius. The diameter of a circle is the distance across the circle, passing through the center point. The diameter of a circle is twice the length of the radius. In other words, the diameter is the longest chord of the circle. Here is a diagram showing the parts of a circle:

Part of Circle Definition
Center The point inside the circle from which all points on the circle are equally distant.
Radius The distance from the center to any point on the circle.
Diameter The distance across the circle, passing through the center point. The diameter is twice the length of the radius.
Chord A line segment that connects two points on the circle.
Circumference The distance around the circle.

## Calculating the Diameter of a Circle

There are different formulas and methods to calculate the diameter of a circle, depending on the information that is given. Here are some of the most common methods:

### Method 1: Using the Radius

As we mentioned earlier, the diameter of a circle is twice the length of the radius. Therefore, if you know the radius of a circle, you can easily calculate the diameter using this formula:

diameter = 2 x radius

To use this formula, simply substitute the value of the radius into the equation, and then solve for the diameter. Here is an example:

Example:

Given that the radius of a circle is 5 cm, what is the diameter of the circle?

Solution:

diameter = 2 x radius = 2 x 5 cm = 10 cm

### Method 2: Using the Circumference

The circumference of a circle is the distance around the circle. It is related to the diameter by the formula:

circumference = pi x diameter

where pi is a mathematical constant that is approximately equal to 3.14 (or more precisely, 3.14159265358979323846…).

If you know the circumference of a circle, you can use this formula to calculate the diameter:

diameter = circumference / pi

To use this formula, simply substitute the value of the circumference into the equation, and then solve for the diameter. Here is an example:

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Example:

Given that the circumference of a circle is 20 cm, what is the diameter of the circle?

Solution:

diameter = circumference / pi = 20 cm / 3.14 = 6.37 cm (rounded to two decimal places)

### Method 3: Using the Area

The area of a circle is the amount of space enclosed by the circle. It is related to the diameter by the formula:

area = pi x radius^2

If you know the area of a circle, you can use this formula to calculate the diameter:

diameter = 2 x square root of (area / pi)

To use this formula, simply substitute the value of the area into the equation, and then solve for the diameter. Here is an example:

Example:

Given that the area of a circle is 25 cm^2, what is the diameter of the circle?

Solution:

diameter = 2 x square root of (area / pi) = 2 x square root of (25 cm^2 / 3.14) = 5.64 cm (rounded to two decimal places)

## FAQ

### 1. What is the diameter of a circle?

The diameter of a circle is the distance across the circle, passing through the center point. The diameter of a circle is twice the length of the radius.

### 2. What is the formula for calculating the diameter of a circle?

The formula for calculating the diameter of a circle depends on the information that is given. If you know the radius, you can use the formula diameter = 2 x radius. If you know the circumference, you can use the formula diameter = circumference / pi. If you know the area, you can use the formula diameter = 2 x square root of (area / pi).

### 3. How do I measure the diameter of a circle?

To measure the diameter of a circle, you can use a ruler or a measuring tape. Place the ruler or tape across the circle, passing through the center point, and measure the distance between two points on the circle.

### 4. Can the diameter of a circle be negative?

No, the diameter of a circle cannot be negative. It is a distance, which is always positive.

### 5. What is pi?

Pi is a mathematical constant that is approximately equal to 3.14 (or more precisely, 3.14159265358979323846…). It is the ratio of the circumference of a circle to its diameter.

## Conclusion

Calculating the diameter of a circle is an important skill in many fields, such as engineering, physics, and mathematics. By using the formulas and methods described in this article, you can easily calculate the diameter of any circle given the appropriate information. We hope this article was helpful for you.