Orthocenter, centroid, circumcenter, incenter, line of Euler, heights, medians, The orthocenter is the point of intersection of the three heights of a triangle. Every triangle has three “centers” — an incenter, a circumcenter, and an orthocenter — that are Incenters, like centroids, are always inside their triangles. Triangles have amazing properties! Among these is that the angle bisectors, segment perpendicular bisectors, medians and altitudes all meet with the .

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Circumcenterconcurrency of the three perpendicular bisectors Incenterconcurrency of the three angle bisectors Orthocenterconcurrency of the three altitudes Centroidconcurrency of the three medians For any triangle all three medians intersect at one point, known as the centroid. Remember, the altitudes of a triangle cetnroid not go through the midpoints of the legs unless you have a special triangle, like an equilateral triangle. You see that even though the circumcenter is outside the triangle in the case of the obtuse triangle, it is still equidistant from all three vertices of the triangle.

Centroidconcurrency of the three medians.

### Triangle centers: Circumcenter, Incenter, Orthocenter, Centroid

Contents of this section: This page summarizes some of them. Orthocenter Draw a line called the “altitude” at right angles to a side and going through the opposite corner.

Sorry I don’t know how to do diagrams on this site, but what I mean by that is: If you have Geometer’s Sketchpad and would like to see the GSP construction of the incenter, click xnd to download it. This file also has all the centers together in one picture, as well as the equilateral triangle.

Orthocenterconcurrency of the three altitudes. 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.

Like the circumcenter, the orthocenter does not have to be inside the triangle. The incenter is the last triangle center we will be investigating. It can be used to generate all of the pictures above.

The orthocenter and circumcenter are isogonal conjugates of one another. For the centroid in particular, it divides each of the medians in a 2: It is the point forming the origin of a circle inscribed inside the triangle. It is pictured below as the red dashed line. There are actually thousands of centers! It is found by finding the midpoint of each leg of the triangle and constructing a line perpendicular to that leg at its midpoint.

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. The circumcenter is the center of the circle such that all three vertices of the circle are the same distance away from the circumcenter.

In this assignment, we will be investigating 4 different triangle centers: Note that sometimes the edges of the triangle have to be extended outside the triangle to draw the altitudes.

It is the balancing point to use if you want to balance a triangle on the tip of a pencil, for example. Circumcenterconcurrency of the three perpendicular bisectors. Summary of geometrical theorems summarizes the proofs of concurrency of the lines that determine orthocenher centers, as well as many other proofs in geometry.

In a right triangle, the orthocenter falls on a vertex of the triangle. SKIP to Assignment 5: Circumcenterconcurrency of the three perpendicular bisectors Incenterconcurrency of the three angle bisectors Orthocenterconcurrency of the three altitudes Centroidconcurrency of the three medians. The orthocenter is the point of circymcenter of the three heights of a triangle.

## Orthocenter, Centroid, Circumcenter and Incenter of a Triangle

Then the orthocenter is also outside the triangle. Draw a line called the “angle bisector ” from a corner so that it splits the angle in half Where all three lines intersect is the center of a triangle’s “incircle”, called the “incenter”:. The three angle bisectors of the angles of the triangle also intersect at one point – the incenter, and this point is the center of the inscribed circle inside the triangle. You see the three medians as the dashed lines in the figure below.

Where all three lines intersect is the circumcenter. The three circumfenter lines perpendicular to one side that pass through the remaining vertex of the triangle intersect at one point, known as the orthocenter of the triangle. Trianggle the centroid, the incenter is always inside the triangle.

See the pictures below for examples of this. The centroid divides each median into two segmentsthe segment joining the centroid to the vertex is twice the length of the length of the line segment joining the midpoint to the opposite side.

Where all three lines intersect is the centroidwhich is also the “center of mass”: The centroid is the point of intersection of the three medians. Centroid, Circumcenter, Incenter and Orthocenter For each of those, the “center” is where special lines cross, so it all depends on those lines!