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Central Angle Calculator | Angle Measurements for Practical Uses

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A central angle is an angle formed by two radii of a circle that connects the center of the circle to the points on its circumference. Central angle calculations are crucial in various fields such as geometry, astronomy, engineering, and navigation. In this article, we will discuss the central angle formula, present our powerful Central Angle Calculator, and explore its practical applications.

Central Angle Formula

The central angle formula calculates the angle formed by a circular arc using the following equation:

C = L / r

where: C is the central angle in radians L is the arc length r is the radius

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To calculate a central angle, simply divide the arc length by the radius. This gives the central angle in radians. To convert the result to degrees, multiply it by 57.2958.

Central Angle Calculator

Our Central Angle Calculator is a user-friendly tool that simplifies complex calculations, allowing you to determine central angles with ease. Here’s how it works:

Input Parameters and Unit Options

  1. Arc Length (L) – Enter the arc length value and choose from a variety of units: nanometers (nm), picometers (pm), millimeters (mm), centimeters (cm), meters (m), kilometers (km), inches (in), feet (ft), and yards (yd).
  2. Radius (r) – Input the radius and select the desired unit from the same list as above.

Output and Unit Options

The calculator will provide the central angle in either radians or degrees, depending on your preference.

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Example Calculation Arc Length: 45 meters (m) Radius: 80 meters (m) Central Angle: 0.5625 radians

Applications of Central Angle Calculator

The Central Angle Calculator has various applications in different fields:

  1. Geometry – Solve problems involving circular sectors and arc lengths.
  2. Astronomy – Determine angular distances between celestial bodies.
  3. Engineering – Calculate stress and strain in circular components.
  4. Navigation – Find the angle between two locations on Earth using their coordinates.

Frequently Asked Questions

How to use the calculator?

Simply input the arc length and radius values, select the desired units, and choose between radians and degrees for the output.

Why are central angles important?

Central angles are crucial in various applications, including geometry, astronomy, engineering, and navigation. They help in determining angular distances, solving problems related to circular sectors, and calculating stress and strain in circular components.


The Central Angle Calculator is an invaluable tool for anyone working with angles in circles. It simplifies complex calculations, allowing you to accurately determine central angles for various applications. With a user-friendly interface and a range of input and output options, this calculator is your go-to resource for mastering central angle calculations. Give it a try and see how it can enhance your understanding of angles in circles and their practical applications.

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