Chord Calculator

Category: Geometry
- April 04, 2025
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Calculate various properties of a chord in a circle including chord length, arc length, chord height, and more. This calculator supports multiple calculation methods and provides visualizations with step-by-step explanations.

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About Chords in Geometry

A chord is a line segment whose endpoints both lie on a circle. Chords are important in geometry and have numerous applications in mathematics, physics, engineering, and more.

Key Properties and Formulas
  • Chord Length: c = 2r × sin(θ/2) [where r is radius and θ is central angle]
  • Chord Height: h = r - d = r(1 - cos(θ/2)) [where d is distance from chord to center]
  • Arc Length: s = r × θ [where θ is in radians]
  • Distance from Center: d = r × cos(θ/2)
  • Segment Area: A = (r²/2) × (θ - sin(θ)) [where θ is in radians]
Important Relationships
  • The perpendicular bisector of a chord passes through the center of the circle.
  • Equal chords are equidistant from the center.
  • Chords equidistant from the center are equal in length.
  • If two chords intersect, the product of the segments of one chord equals the product of the segments of the other.
  • The chord length relates to the chord height by the formula: c² = 4r × h - 4h².
Applications

Chords have many practical applications:

  • Construction: Laying out circular arcs and curves
  • Engineering: Designing circular components and curves
  • Physics: Analyzing circular motion and wave propagation
  • Music Theory: The term "chord" in music originates from geometry
  • Architecture: Planning arches and curved structures
  • Astronomy: Calculating distances and angles in celestial observations

What Is the Chord Calculator?

The Chord Calculator is a straightforward yet effective tool for calculating measurements related to chords in a circle. Whether you’re dealing with the radius, central angle, chord height, or arc length, this tool can assist you in quickly finding missing values. It’s perfect for students, educators, engineers, and anyone involved in circular geometry.

Formulas Used in Chord Calculations

Chord Length: \( c = 2r \times \sin\left(\frac{\theta}{2}\right) \)

Chord Height: \( h = r - r \times \cos\left(\frac{\theta}{2}\right) \)

Arc Length: \( s = r \times \theta \) (θ in radians)

Distance from Centre: \( d = r \times \cos\left(\frac{\theta}{2}\right) \)

Segment Area: \( A = \frac{r^2}{2} \times (\theta - \sin(\theta)) \)

How to Use the Calculator

Using the Chord Calculator is quite simple. Just follow these steps:

  • Select the calculation method that corresponds to your known values.
  • Input the necessary measurements (e.g., radius, chord length, angle).
  • Choose your preferred units from the dropdown menus.
  • Click the Calculate button to view the results.
  • Check out optional visualisations and step-by-step explanations.
  • If needed, click Reset to start afresh.

Features at a Glance

  • Supports various calculation methods
  • Adjustable units and decimal precision
  • Visual diagrams for better comprehension
  • Step-by-step breakdown of calculations
  • Includes formulas and theory sections

Why Use This Calculator?

This tool helps save time and minimise errors when working with circles. Instead of manually solving equations, you get immediate answers with clear explanations. It’s particularly beneficial in:

  • Education: Learning and teaching circle geometry
  • Engineering: Designing parts with circular features
  • Construction: Planning curved elements and arcs
  • Architecture: Visualising and measuring arches
  • Astronomy: Measuring distances and angles in circular paths

Frequently Asked Questions (FAQ)

What is a chord in a circle?
A chord is a straight line connecting two points on the circumference of a circle.

Do I need to know the radius to use this calculator?
No. The calculator offers several methods. You can use values like chord height, arc length, or diameter instead.

Can I switch between degrees and radians?
Yes. Use the angle unit selector under advanced options to toggle between degrees and radians.

What units does it support?
You can choose from millimetres, centimetres, metres, inches, and feet.

Is this tool accurate?
Yes, calculations use precise mathematical functions. You can even set the number of decimal places for accuracy.

Does it work on mobile devices?
Yes, the calculator is responsive and works on phones, tablets, and desktops.

Final Thoughts

The Chord Calculator is a practical tool for exploring circle geometry. It makes it easy to understand how measurements relate and gives you the confidence to work with curved shapes. Whether you’re solving a homework problem or working on a design project, this tool is here to assist you.