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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The altitude of a triangle is created by dropping a line from each vertex that is perpendicular to the opposite side. SKIP to Assignment 5: The incenter is the center of the circle inscribed in the triangle. In this assignment, we will be investigating 4 different triangle centers: In the obtuse triangle, the orthocenter falls outside the triangle. Centtoid incenter is the last triangle center we will be investigating. It is the balancing point to use if you want to balance a triangle on the tip of a pencil, for example.

Sorry I don’t know how to do diagrams on this site, but trizngle I mean by that is: Where all three lines intersect is the centroidwhich is also the “center anf mass”:.

## Triangle Centers

The angle bisectors of a triangle are each one of the lines that divide an angle into two equal angles. For each of those, the “center” is where special lines cross, so it all depends on those lines!

See the pictures below for examples of this. Check out the cases of the obtuse and right triangles below. If you have Geometer’s Sketchpad and would like to see the GSP construction of the incenter, click here to download it.

Let’s look at each one: 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.

It is constructed by taking the intersection of the angle bisectors of the three vertices of the triangle. 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.

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

The orthocenter and circumcenter are isogonal conjugates of one another. There is an interesting relationship between the centroid, orthocenter, and circumcenter of a triangle. Circumcenter Draw a line called a “perpendicular bisector” orthofenter right angles to the midpoint of each side. Draw a line called a “perpendicular bisector” circumcentwr right angles to the midpoint of centroie side.

In fact, it can be outside the triangle, as in the case of an obtuse triangle, or it can fall at the midpoint of the hypotenuse of a right triangle. Hide Ads About Ads. 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.

Draw a line called the “altitude” at orthocentter angles to a side and going through the opposite corner. Inscribed Circle and Angle Bisectors. 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.

If you have Geometer’s Sketchpad and would like to see the GSP construction of the circumcenter, click here to download it. Orthocenter, Centroid, Circumcenter and Incenter of a Triangle.

Where all three lines intersect is the centroidwhich is also the “center of mass”: The orthocenter is the center of the triangle created from finding the altitudes of each side. Like the centroid, the incenter is always inside the triangle. The circumcenter is not always inside the triangle. A height is each of the perpendicular lines drawn from one vertex to the opposite side or its extension.

Draw a line called a “median” from a corner to the midpoint of the opposite side. I believe all of these can be proved using vectors and also expressions for finding these points in circumcentfr triangle can be found. Like the circumcenter, the orthocenter does not have to be inside the triangle.

Where all three lines intersect is the center of a triangle’s “circumcircle”, called the “circumcenter”: Incenterconcurrency of the three angle bisectors. Circumcenterconcurrency of the three perpendicular bisectors. The orthocenter is the point of intersection of the three heights of a triangle.

Here are the 4 most popular ones: Centroidconcurrency of the three medians. If you have Geometer’s Sketchpad and would like to see the GSP construction of the centroid, 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. 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.