Triangle Inscribed in A Circle Calculator


Calculating the properties of a triangle inscribed in a circle is a common task in geometry. To simplify this process, we present a convenient online calculator using HTML and JavaScript. This calculator will help you determine essential values of a triangle inscribed in a circle effortlessly.

How to Use

  1. Input Side Lengths: Enter the side lengths of the triangle in the provided input fields.
  2. Click Calculate: Hit the “Calculate” button to trigger the JavaScript function that computes the results.
  3. Review Results: The calculated values, including angles and area, will be displayed within the form.


The calculation for a triangle inscribed in a circle involves various trigonometric functions. The most accurate formula for calculating the angles and area is as follows:


  • a and b are the side lengths of the triangle.
  • r is the radius of the circumscribed circle.


Consider a triangle with side lengths a=5, b=7, and a circumscribed circle of radius r=4.


Q: Can I use this calculator for any triangle inscribed in a circle?

A: Yes, the calculator is designed to work with any triangle where you know the side lengths and the radius of the circumscribed circle.

Q: What if I don’t know the radius of the circumscribed circle?

A: You need to know the radius (r) to use this calculator. If it’s not given, you may need additional information to find it.

Q: Are the results accurate?

A: The results are accurate based on the provided side lengths and circumscribed circle radius. Ensure your input values are correct.


This calculator simplifies the calculation of a triangle inscribed in a circle, making it accessible to anyone. Understanding the angles and area of such a triangle is crucial in geometry, and this tool provides an efficient way to obtain accurate results.


  • Raees Mughal

    Meet Raees Mughal, a seasoned SEO author whose expertise lies at the intersection of compelling content and search engine optimization. With a passion for crafting engaging narratives and a keen understanding of the ever-evolving SEO landscape, Raees brings a unique blend of creativity and technical proficiency to the world of digital content. Raees Mughal has a proven track record of helping businesses enhance their online visibility and reach through strategic SEO-driven content. Whether it's creating keyword-rich articles, optimizing website copy, or developing content marketing strategies, Raees leverages his in-depth knowledge of SEO best practices to drive organic traffic and improve search engine rankings.

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