Circumcenter of triangle is the allude where 3 perpendicular bisectors indigenous the sides of a triangle intersect or meet. The circumcenter that a triangle is likewise known together the point of concurrency that a triangle. The allude of origin of a circumcircle i.e. A one inscribed within a triangle is additionally called the circumcenter. Let united state learn more about the circumcenter of triangle, the properties, ways to locate and construct a triangle, and solve a couple of examples.

You are watching: Properties of the circumcenter of a triangle

1.What is the Circumcenter of Triangle?
2.Properties of Circumcenter that Triangle
3.Constructing Circumcenter the Triangle
4.Formulas to find the Circumcenter of Triangle
5.FAQs top top Circumcenter of Triangle

What is the Circumcenter the Triangle?

The circumcenter of triangle deserve to be discovered out as the intersection that the perpendicular bisectors (i.e., the present that are at ideal angles to the midpoint of each side) of every sides of the triangle. This means that the perpendicular bisectors of the triangle are concurrent (i.e. Meeting at one point). Every triangles room cyclic and also hence, deserve to circumscribe a circle, therefore, every triangle has a circumcenter. To build the circumcenter of any kind of triangle, perpendicular bisectors of any kind of two political parties of a triangle room drawn.

Definition the Circumcenter

The circumcenter is the center suggest of the circumcircle drawn about a polygon. The circumcircle of a polygon is the circle the passes through every one of its vertices and the center of the circle is called the circumcenter. Every polygons that have actually circumcircles are recognized as cyclic polygons. However, all polygons need not have actually a circumcircle. Only continuous polygons, triangles, rectangles, and right-kites can have the circumcircle and thus the circumcenter.


Properties of Circumcenter of Triangle

A circumcenter of triangle has countless properties, let us take a look:

Consider any ΔABC through circumcenter O.

Property 1: every the vertices the the triangle room equidistant from the circumcenter. Let united state look at the image below to know this better. Sign up with O to the vertices of the triangle.


AO = BO = CO. Hence, the vertices the the triangle room equidistant indigenous the circumcenter.

Property 2. All the new triangles formed by authorized O come the vertices room Isosceles triangles.

Property 3. ∠BOC = 2 ∠A as soon as ∠A is acute or when O and also A are on the exact same side of BC.

Property 4. ∠BOC = 2( 180° - ∠A) as soon as ∠A is obtuse or O and also A room on different sides that BC.

Property 5. Ar for the circumcenter is different for different varieties of triangles.

Acute angle Triangle: The place of the circumcenter of an acute edge triangle is inside the triangle. Here is an image for better understanding. Allude O is the circumcenter.


Obtuse edge Triangle: The circumcenter in an obtuse angle triangle is located exterior the triangle. Point O is the circumcenter in the below-seen image.


Right Angled Triangle: The circumcenter in a right-angled triangle is located on the hypotenuse of a triangle. In the picture below, O is the circumcenter.


Equilateral Triangle: all the 4 points i.e. Circumcenter, incenter, orthocenter, and centroid coincide v each various other in an equilateral triangle. The circumcenter divides the it is provided triangle into three same triangles if joined v vertices of the triangle. Also, other than for the it is intended triangle, the orthocenter, circumcenter, and also centroid lied in the very same straight line recognized as the Euler Line for the other types of triangles.

Constructing Circumcenter of Triangle

To build the circumcenter the triangle, we usage a geometric tool dubbed the compass. The compass is composed of 2 ends, where one end is inserted on the hypotenuse that the triangle and also the second end is on the peak of the triangle. The measures to build a circumcenter that triangle are:

Step 1: attract the perpendicular bisectors of every the political parties of the triangle using a compass.Step 2: prolong all the perpendicular bisectors to satisfy at a point. Mark the intersection suggest as O, this is the circumcenter.Step 3: utilizing a compass and also keeping O together the center and any peak of the triangle together a allude on the circumference, draw a circle, this one is our circumcircle whose facility is O.


Formulas to situate the Circumcenter that Triangle

To find or calculate the circumcenter the triangles, over there are various formulas that deserve to be applied. The various methods through i m sorry we can locate the circumcenter O(x,y) the a triangle whose vertices are given as ( ext A(x_1,y_1), ext B(x_2,y_2)space ext and space ext C(x_3,y_3)) space as follows along with the steps.


Method 1: utilizing the Midpoint Formula

Step 1: calculation the midpoints that the heat segments AB, AC, and also BC using the midpoint formula.

( eginequation M(x,y) = left(dfrac x_1 + x_2 2 , dfracy_1 + y_22 ight) endequation)

Step 2: Calculate the slope of any type of of the line segments AB, AC, and also BC.

Step 3: By utilizing the midpoint and the steep of the perpendicular line, find out the equation the the perpendicular bisector line.

( (y-y_1) = left(- dfrac1m ight)(x-x_1))

Step 4: Similarly, find out the equation of the various other perpendicular bisector line.

Step 5: fix two perpendicular bisector equations to uncover out the intersection point.

This intersection suggest will it is in the circumcenter that the offered triangle.

Method 2: making use of the street Formula

(eginequation d = sqrt( x - x_1) ^2 + ( y - y_1) ^2 endequation)

Step 1 : discover (d_1, d_2space and also space d_3)

< eginequation d_1= sqrt( x - x_1) ^2 + ( y - y_1) ^2 endequation> (d_1) is the distance in between circumcenter and also vertex (A).

< eginequation d_2= sqrt( x - x_2) ^2 + ( y - y_2) ^2 endequation> (d_2) is the distance in between circumcenter and also vertex (B).

< eginequation d_3= sqrt( x - x_3) ^2 + ( y - y_3) ^2 endequation> (d_3) is the distance between circumcenter and vertex (C).

Step 2 : Now through computing, (d_1 = d_2space = space d_3) we can discover out the coordinates of the circumcenter.

This is the widely used distance formula to recognize the street between any kind of two points in the name: coordinates plane.

Method 3: Using extended Sin Law


(eginequation dfrac a sin A=dfracb sin B =dfracc sin C = 2R endequation)

Given the a, b, and c are lengths of the matching sides the the triangle and also R is the radius of the circumcircle.

By utilizing the extended form of sin law, we can discover out the radius that the circumcircle, and using the street formula can find the specific location that the circumcenter.

Method 4: utilizing the Circumcenter Formula

We deserve to quickly uncover the circumcenter by using the circumcenter the a triangle formula:

<eginequation O(x, y)=left(fracx_1 sin 2 A+x_2 sin 2 B+x_3 sin 2 Csin 2 A+sin 2B+sin 2 C,\ fracy_1 sin 2 A+y_2 sin 2 B+y_3 sin 2 Csin 2 A+sin 2 B+sin 2 C ight) endequation>

Where ∠A, ∠B, and also ∠C are corresponding angles that ΔABC.

Related Topics

Listed listed below are a few topics regarded the circumcenter of triangle, take it a look.

Example 1: Shemron has a cake the is shaped like an equilateral triangle of political parties (sqrt3 ext inch) each. He desires to find out the dimension of the circular base of the cylindrical crate which will certainly contain this cake.



Since it is an equilateral triangle, ( ext AD) (perpendicular bisector) will go with the circumcenter ( ext O ). Currently using circumcenter facts that the Circumcenter will certainly divide the it is provided triangle into three same triangles if joined with the vertices.


<eginalign* ext area the riangle AOC = ext area that riangle AOB \= ext area the riangle BOC endalign*>


<eginalign* ext area of riangle ABC &= 3 imes ext area the riangle BOC endalign* >

Using the formula because that the area that an equilateral triangle <eginalign* &= dfracsqrt34 imes a^2 endalign* >

Also, area that triangle <eginalign* &= dfrac12 imes ext base imes ext elevation endalign* >

On substituting us get,

<eginalign* dfracsqrt34 imes a^2 &= 3 imes dfrac12 imes a imes OD\OD &= dfrac12sqrt3 imes a endalign*>

Now because that ( riangle ext ABC)

Again making use of formula for area the ( riangle ext ABC) = ( dfrac12 imes ext base imes ext elevation ) = ( dfracsqrt34 imes a^2 )

<eginalign*dfrac 12 imes a imes (R+OD) &= dfrac sqrt 34 imes a^2 \dfrac12 a imes left( R+dfrac a2sqrt3 ight) &= dfracsqrt34 imes a^2\R &= dfrac asqrt3 endalign*>


< eginalign*a & = sqrt3 endalign*>

R = 1 inch.

Example 2: Charlie concerned know the the circumcenter that a Right-angled triangle lies in the exact facility of the hypotenuse. He wants to check this with a Right-angled triangle of political parties L(0,5), M(0,0), and also N(5,0)). Deserve to you help him in confirming this fact?



Using the circumcenter formula or circumcenter the a triangle formula native circumcenter geometry:

< eginequation O(x, y)=left(dfracx_1 sin 2 A+x_2 sin 2 B+x_3 sin 2 Csin 2 A+sin 2B+sin 2 C,\ dfracy_1 sin 2 A+y_2 sin 2 B+y_3 sin 2 Csin 2 A+sin 2 B+sin 2 C ight) endequation>

Putting the corresponding values,

< O(x,y) = dfrac 52 , dfrac 52>.

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Example 3: Thomas has triangular cardboard whose one side is 19 inches and the opposite edge to that side is 30°. He desires to recognize the base area of the cylindrical box so that he have the right to fit this map in that completely.