Introduction to Arc Length

Calculating the length of an arc is a fundamental concept in geometry and trigonometry. An arc is a portion of a curve, typically a segment of a circle. Whether you’re working on a math problem or designing something in real life, determining the length of an arc is a valuable skill. In this article, we’ll introduce you to an ARC Length Calculator and explain how it works.

Understanding Arc Length

Before we dive into the calculator, let’s understand the components involved in calculating the length of an arc:

  • Radius (r): This is the distance from the center of the circle to the starting point of the arc.
  • Angle (θ): The angle formed at the center of the circle by the arc. It is typically measured in degrees.
  • Arc Length (L): The length of the arc you want to calculate.

The formula to calculate the arc length is:



  • is the arc length.
  • is the central angle in degrees.
  • is the radius of the circle.
  • (pi) is approximately equal to 3.14159.

Using the ARC Length Calculator

Our ARC Length Calculator simplifies the process of finding the length of an arc. Here’s how to use it:

  1. Input Values: Enter the values for the central angle () and the radius () of the circle.
  2. Calculate: Click the “Calculate” button, and the calculator will instantly provide you with the length of the arc ().
  3. Reset: To perform another calculation, click the “Reset” button to clear the input fields.

Practical Uses of Arc Length Calculations

Arc length calculations have practical applications in various fields, including:

  • Engineering: Calculating the length of an arc in a mechanical or structural component, such as a gear tooth, pulley, or conveyor belt.
  • Mathematics: Solving geometry problems that involve circular arcs, such as finding the length of a sector of a circle.
  • Architecture: Determining the dimensions of curved architectural elements, like arches and door frames.
  • Trigonometry: Using arc length calculations to study trigonometric functions and their relationships to the unit circle.


Calculating the length of an arc is a valuable skill that can be used in various mathematical and practical applications. Our ARC Length Calculator simplifies the process, allowing you to find the arc length quickly and accurately. Whether you’re a student, engineer, or anyone dealing with circular geometry, this tool can be a helpful resource in your calculations.

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