Incenter, Orthocenter, Circumcenter, Centroid. Date: 01/05/97 at From: Kristy Beck Subject: Euler line I have been having trouble finding the Euler line. Orthocenter: Where the triangle’s three altitudes intersect. Unlike the centroid, incenter, and circumcenter — all of which are located at an interesting point of. They are the Incenter, Orthocenter, Centroid and Circumcenter. The Incenter is the point of concurrency of the angle bisectors. It is also the center of the largest.

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To see that the incenter is in fact always inside the triangle, let’s take a look at an obtuse triangle and a right triangle. The incenter I of a triangle is the point of intersection of the three angle bisectors of the triangle.

There are several special points in the center of a triangle, but focus on four of them: Triangle Centers Where is the center of a triangle? If you have Geometer’s Sketchpad and would like to see the GSP constructions of all four centers, click here to download it. Like the circumcenter, the orthocenter does not have to be inside the triangle. If you have Geometer’s Sketchpad and would like to see the GSP construction of the orthocenter, click here to download it.

Check out the cases of the obtuse and right triangles below. Where all three lines intersect is the centroidwhich is also the “center of mass”:. This file also has all the centers together in one picture, as well as the equilateral triangle. In a right triangle, the orthocenter circumcentet on a vertex of the triangle. The incenter is the last triangle center we will be investigating. The circumcenter is the center of a triangle’s circumcircle circumscribed circle.


Thus, the incenter I is equidistant from all three sides of the triangle. A median is each of the straight lines that joins the midpoint incentdr a side with the opposite vertex.

There is an interesting relationship between the centroid, orthocenter, and circumcenter of a triangle. It can be used to generate all of the pictures above. Centroid Draw a line oethocenter a “median” from a corner to the midpoint of the opposite side. Orthocenter Draw a line called the “altitude” at right angles to a side and going through the opposite corner.

It is constructed by taking the intersection of the angle bisectors of the three orthocentsr of the triangle. Then the orthocenter is also outside the triangle.

Math Forum – Ask Dr. Math

The orthocenter H of a triangle is the point of intersection of the three altitudes of the triangle. Thus, the radius of the circle is the distance between the circumcenter and any of the triangle’s three vertices. Since H is the orthocenter, H is on DM by the definition of orthocenter. A height is each of the perpendicular ortyocenter drawn from one vertex to the opposite side circjmcenter its extension. You can look at the above example of an acute triangle, or the below examples of an obtuse triangle and a right triangle to see that this is the case.


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Since G is the centroid, G is on DX by the definition of centroid. Remember, the altitudes of a triangle do not go through the midpoints incenger the legs unless you have a special triangle, like an equilateral triangle. Where all three lines intersect is the centroidwhich is also the “center of mass”: The incenter is the point of intersection of the three angle bisectors.

Triangle Centers

The orthocenter is the point of intersection of the three heights of a triangle. The centroid of a triangle is constructed by taking any given triangle and connecting the midpoints of each leg of the triangle to the opposite vertex.

There are actually thousands of centers! In the obtuse triangle, the orthocenter falls outside the triangle.

Orthocenter, Centroid, Circumcenter and Incenter of a Triangle. See the pictures below for examples of this. Thus, H’ is the orthocenter because it is circhmcenter on all three altitudes. The circumcenter is not always inside the triangle. However, this has not been proven yet.

Where all three lines intersect is the “orthocenter”:. So, label the point of intersection H’.