A carpenter design a triangle table that had actually one leg. He supplied a special point of the table which was the facility of gravity, because of which the table to be balanced and stable.

You are watching: Which points of concurrency are always inside the triangle

Do you know what this special suggest is known as and how perform you uncover it?

This special allude is the suggest of concurrency the medians.

In this page, you will learn all about the point of concurrency.This mini-lesson will also cover the suggest of concurrency of perpendicular bisectors, the point of concurrency that the edge bisectors that a triangle, and interesting practice questions.Let’s begin!

Lesson Plan

1.What Is the allude of Concurrency?
2.Important notes on the allude of Concurrency
3.Solved examples on the suggest of Concurrency
4.Challenging inquiries on the suggest of Concurrency
5. Interactive questions on the allude of Concurrency

What Is the point of Concurrency?

The suggest of concurrency is apoint where 3 or more linesor raysintersect through each other.

For example, introduce to the image shown below, point A is the allude of concurrency, and all the three rays l, m, n room concurrent rays.

Triangle Concurrency Points

Four different types of line segments can be drawn for atriangle.

Please refer to the complying with table for the above statement:

Name that the line segmentDescriptionExample
Perpendicular BisectorThese room the perpendicular lines drawn to the political parties of the triangle.


Angle BisectorThese present bisect the angle of the triangle.


MedianThese heat segments connect any vertex the the triangle come the mid-point of opposing side.


AltitudeThese space the perpendicular lines drawn to the opposite side from the vertices of the triangle.


As 4 different types of heat segments can be drawn to a triangle, an in similar way we have actually four different points of concurrency in a triangle.

These concurrent points are referred to as various centers according to the lines meeting at the point.

The different points that concurrency in the triangle are:


1. Circumcenter

The circumcenter is the point of concurrency the theperpendicular bisectors of all the sides of a triangle.


For an obtuse-angled triangle, the circumcenter lies exterior the triangle.

For a right-angled triangle, the circumcenter lies in ~ the hypotenuse.

If we attract a circle taking a circumcenter together thecenter and touching the vertices that the triangle, we gain a circle known as a circumcircle.


2. Incenter

The incenter is the suggest of concurrency of theangle bisectors of every the inner anglesof thetriangle.

In various other words, the suggest where three angle bisectorsof the angles of the triangle fulfill areknown as the incenter.

The incenter always lies within the triangle.


The circle that is attracted taking the incenter together the center, is well-known as the incircle.


3. Centroid

The suggest where three mediansof the triangle satisfy isknown together the centroid.


In Physics, we usage the term"center of mass" and itlies in ~ the centroid the the triangle.

Centroid always lies in ~ the triangle.

It always divides each median into segments in the ratio of 2:1.

4. Orthocenter

The suggest where 3 altitudesof the triangle meet isknown as the orthocenter.

For an obtuse-angled triangle, the orthocenter lies exterior the triangle.


Observe the different congruency points of a triangle with the complying with simulation:


Example 1

Ruth needs to determine the figure which accurately represents the development of an orthocenter. Can you aid her figure out this?



The allude where the 3 altitudes that a triangle meet are known as the orthocenter.

Therefore, the orthocenter is a concurrent suggest of altitudes.


( herefore)Figure C represents an orthocenter.
Example 2

Shemron hasa cake that is shaped favor an it is intended triangle of sides (sqrt3 ext in) each. He wants to uncover out the radiusofthe circular base of the cylindricalbox which will contain this cake.



Since it isan equilateral triangle, ( ext AD) (perpendicular bisector)will go with the circumcenter ( ext O ).

The circumcenter will certainly divide the it is provided triangle into three same triangles if joined with the vertices.


<eginalign* ext area riangle AOC &= ext area riangle AOB = ext area riangle BOC endalign*>


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

Using the formula because that the area the an it is intended triangle<eginalign* &= dfracsqrt34 imes a^2 hspace3cm ...1 endalign* >

Also, area that triangle <eginalign* &= dfrac12 imes ext basic imes ext elevation hspace1cm ...2 endalign* >

By using equation 1 and also 2 for ( riangle extBOC) we get,

<eginalign* dfracsqrt34 imes a^2 &= 3 imes dfrac12 imes a imes OD\OD &= dfrac12sqrt3 imes ahspace2cm ...3endalign*>

Now, by applying equation 1 and 2 for ( riangle extABC) we get,

( extArea the the riangle ext ABC ) <= dfrac12 imes ext basic imes ext height =dfracsqrt34 imes a^2 ...4>

Using equation 3 and 4, us get

<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 & = sqrt3endalign*>

( herefore) ( ext R = 1 extin)

Example 3

A teacher attracted 3 medians of a triangle and asked his student to surname the concurrent point of these three lines. Deserve to you name it?


The allude where three mediansof the triangle meet areknown as the centroid.

The concurrent allude drawn by the teacher is-

( herefore)Centroid
Example 4

For an it is provided ( riangle extABC), if ns is the orthocenter, discover the value of ( angle BAP).


For an equilateral triangle, every the four points (circumcenter, incenter, orthocenter, and centroid) coincide.

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Therefore, point P is additionally an incenter that this triangle.

Since this is an it is intended triangle in which all the angles room equal, the value of ( angle BAC = 60^circ)