### How do you find the 9 point circle?

## How do you find the 9 point circle?

One way to find the center of the nine point circle (O) is to find the midpoint f the segment that connects the orthocenter (H) and the circumcenter (N), which is the intersection point of the perpendicular bisectors of each side of the original triangle.

## What is meant by nine-point circle?

The nine-point circle, also called Euler’s circle or the Feuerbach circle, is the circle that passes through the perpendicular feet , , and dropped from the vertices of any reference triangle on the sides opposite them.

## What is radius of nine-point circle?

nine-point circle radii. R. ≈ 0.92. r.

## Who discovered the 9 point circle?

Feuerbach

The nine-point circle, discovered by Feuerbach in about 1820, contains the midpoints of the three sides of the triangle and the feet of the three altitudes. Its center is the midpoint of the segment joining the orthocenter and the circumcenter of the triangle, and consequently lies on the Euler line.

## What is the orthocenter formula?

There is no direct formula to calculate the orthocenter of the triangle. It lies inside for an acute and outside for an obtuse triangle. Altitudes are nothing but the perpendicular line ( AD, BE and CF ) from one side of the triangle ( either AB or BC or CA ) to the opposite vertex.

## Is the orthocenter always inside a right triangle?

The orthocenter is not always inside the triangle. If the triangle is obtuse, it will be outside. To make this happen the altitude lines have to be extended so they cross. Adjust the figure above and create a triangle where the orthocenter is outside the triangle.

## How do you find Euler’s line?

To find Euler’s line, follow these steps: a) Find 2 of the 3 centers known to be on Euler’s Line (centroid, circumcenter, or orthocenter). b) Find the equation of the line that passes through these 2 points. c) Find the third center and plug it into the equation you found in step b.

## What is the difference between circumcenter and orthocenter?

The circumcenter is also the center of the circle passing through the three vertices, which circumscribes the triangle. The orthocenter is the point of intersection of the altitudes of the triangle, that is, the perpendicular lines between each vertex and the opposite side.

## What is the orthocenter of a right triangle?

The orthocenter is the intersection point of the altitudes drawn from the vertices of the triangle to the opposite sides. For an acute triangle, it lies inside the triangle. For an obtuse triangle, it lies outside of the triangle. For a right-angled triangle, it lies on the vertex of the right angle.

## How many points are in a nine point circle?

The nine-point circle of a triangle is a circle going through 9 key points: the three midpoints of the sides of the triangle (blue in the below picture), the three feet of the altitudes of the triangle (yellow in the below picture), and the three midpoints from the vertices to the orthocenter of the triangle (green in the below picture).

## Is the nine point circle the circumcircle of the medial triangle?

The nine-point circle is also the circumcircle of the orthic triangle and the medial triangle (the triangle whose vertices are the three midpoints). Furthermore, due to symmetry, we have the following:

## How do you make a nine point triangle?

The black lines are construction of the points, the orange lines are construction of the circle’s centre. Drag the dots A, B, C to change the size and shape of the triangle. Construct the nine point triangle using the instructions here .

## Is the radius of a nine point circle externally tangent to the triangle?

Consequently, the radius of the nine-point circle is exactly half the circumradius of the triangle: riangle CAP △C AP all concur at a single point. Similarly, the nine-point circle is externally tangent to each of the three excircles, and internally tangent to the triangle’s incircle.

How do you find the 9 point circle? One way to find the center of the nine point circle (O) is to find the midpoint f the segment that connects the orthocenter (H) and the circumcenter (N), which is the intersection point of the perpendicular bisectors of each side of the original triangle. What is…