Skip to main content
Search IntMath
Close

450+ Math Lessons written by Math Professors and Teachers

5 Million+ Students Helped Each Year

1200+ Articles Written by Math Educators and Enthusiasts

Simplifying and Teaching Math for Over 23 Years

Tips, tricks, lessons, and tutoring to help reduce test anxiety and move to the top of the class.

What is a Circumcircle? 

Geometry is an important branch of mathematics that deals with shapes, sizes, and spatial relationships. A circumcircle is a type of circle that passes through the vertices of a given polygon or other figure in Euclidean space. In this blog post, we'll take a closer look at what a circumcircle is and how it's used in geometry. 

How to Find the Circumcenter and Circumradius of a Triangle 

The best way to understand what a circumcircle is and how it works is to explore its components. The center point of the circle is known as the "circumcenter," while the radius of the circle is known as the "circumradius." To find these two components for any given triangle, you must first draw an altitude from each vertex to the opposite side. This will create three smaller triangles inside your original triangle. Using Pythagoras' theorem, you can then calculate the length of each altitude and use this information to calculate both the circumcenter and circumradius for your triangle. 

 

Uses for Circumcircles 

In addition to being used to calculate angles inside triangles, circumcircles can also be used to solve problems related to circles in general. For example, if you know all three vertices of a triangle are on a single circle, then that circle must be its circumcircle. Similarly, if you know any three points on a circle are also vertices on some triangle, then that same circle must be their circumcircle as well. As such, knowing how to find both components—the circumference and radius—of any given triangle can help you solve all sorts of geometric problems involving circles. 

 

Conclusion:                    

Circumcircles are an integral part of geometry that allow us to solve various problems related to circles and triangles alike. By understanding exactly what they are and how they're calculated, students can better prepare themselves for more advanced geometric concepts down the line. With enough practice and dedication, anyone can learn how to accurately calculate both the circumference and radius of any given triangle—and by doing so open up new possibilities when it comes solving complex geometric problems!

FAQ

What is circumcircle and its properties?

A circumcircle is a circle that passes through all the vertices of a given polygon or other figure in Euclidean space. Its center point is known as the "circumcenter" and its radius, the "circumradius." The properties of a circumcircle are related to its center point, radius, and circumference. It can be used to calculate angles inside triangles and solve problems related to circles in general.

What is circumcircle Class 9?

In Class 9, students learn how to calculate the circumcenter and circumradius of a triangle. This involves drawing an altitude from each vertex to the opposite side and using Pythagoras' theorem to calculate the length of each altitude. Knowing this information allows them to accurately calculate both components—the circumference and radius—of any given triangle. This is an important part of geometry that can open up new possibilities when it comes solving complex geometric problems.

What is circumcircle and incircle?

A circumcircle is the circle that passes through all the vertices of a given polygon or other figure in Euclidean space, while an incircle is a circle inscribed within a given shape such that its edges are tangent to the sides of that shape. The center point of the circumcircle is known as the "circumcenter" and its radius, the "circumradius," while the center point of the incircle is known as the "incenter" and its radius, the "inradius." Both these circles can be used to calculate angles inside triangles and solve problems related to circles in general.

How do you draw a circumcircle in geometry?

To draw a circumcircle in geometry, you must first draw an altitude from each vertex of your triangle to the opposite side. This will create three smaller triangles within your original triangle. Using Pythagoras' theorem, you can then calculate the length of each altitude and use this information to calculate both the center point and radius for your circumcircle. Finally, you can draw your circumcircle using a compass and draw a line from each vertex to the center point. This will create your circumcircle!  With enough practice and dedication, anyone can learn how to accurately calculate both the circumference and radius of any given triangle—and by doing so open up new possibilities when it comes solving complex geometric problems!

24x7 Tutor Chat

Tips, tricks, lessons, and tutoring to help reduce test anxiety and move to the top of the class.