Orthocenter of a Triangle Calculator

The orthocenter calculator helps you quickly determine the point where the three altitudes of a triangle intersect. In geometry, the orthocenter is one of the most important triangle centers, alongside the centroid, circumcenter, and incenter.

Using this calculator, you can easily compute the coordinates of the orthocenter for any triangle when the vertices are known. Many students use an orthocenter calculator with steps that show work to understand the calculation process while solving geometry problems.

This tool works using principles of Euclidean geometry and analytic geometry, relying on the Cartesian coordinate system to determine where the altitudes intersect.

What is the orthocenter of a triangle?

The orthocenter of a triangle is the point where all three altitudes of the triangle intersect. An altitude is a perpendicular line drawn from a vertex to the opposite side of a triangle.

Depending on the type of triangle, the orthocenter appears in different positions:

In an acute triangle, the orthocenter lies inside the triangle.
In a right triangle, the orthocenter is located at the right-angle vertex.
In an obtuse triangle, the orthocenter lies outside the triangle.

In classical Euclidean geometry, this concept was studied extensively by mathematicians such as Euclid. The orthocenter also forms part of the famous Euler line, a geometric line discovered by Leonhard Euler that connects several triangle centers, including the centroid and circumcenter.

How to find the orthocenter?

To find the orthocenter manually, you must determine the intersection of two altitudes of the triangle. The following are the steps to find the orthocenter:

Steps for how to find the orthocenter:

Consider a triangle with three vertices:

A(1, 3)

B(5, 7)

C(7, 3)

Step 1: Find the slope of BC

Slope of BC:

m = (7 − 3) / (5 − 7)

m = 4 / (−2)

m = −2

Step 2: Perpendicular slope for altitude from A

Since the slope of BC = −2

Perpendicular slope = negative reciprocal of −2

m = 1/2

Step 3: Equation of altitude from A

Using point-slope form:

y − 3 = 1/2 (x − 1)

y − 3 = 1/2 x − 1/2

y = 1/2 x + 5/2

Step 4: Find the slope of AC

Slope of AC:

m = (3 − 3) / (1 − 7)

m = 0 / (−6)

m = 0

Perpendicular slope for altitude from B:

Since the slope of AC = 0

The perpendicular line is vertical.

So altitude from B is:

x = 5

Step 5: Solve equations

Substitute x = 5 into

y = 1/2 x + 5/2

y = 1/2 (5) + 5/2

y = 5/2 + 5/2

y = 10/2

y = 5

So the intersection point is:

H(5, 5)

So the coordinates of the orthocenter are (5, 5).

The coordinates of the orthocenter calculator would produce the same result instantly.

How to Use the Orthocenter Calculator?

For using this calculator, you need to follow the following simple steps:

Enter the coordinates of the three vertices of the triangle.
Click the calculate button.
The tool then calculates the coordinates of the orthocenter.
The orthocenter calculator that shows work displays the calculation steps used to reach the result.

The coordinates of the orthocenter calculator are especially useful for students studying coordinate geometry, where triangles are defined on the coordinate plane.

Orthocenter formula

There is no single simple orthocenter formula like the centroid formula. Instead, the orthocenter is calculated using the intersection of perpendicular altitudes.

For a triangle with vertices:

A(x₁, y₁)

B(x₂, y₂)

C(x₃, y₃)

The process involves:

Finding slopes of the triangle sides
Determining the perpendicular slopes of the altitudes
Writing linear equations of the altitudes
Solving the resulting system of equations

These linear equations can also be solved using matrix methods similar to those applied in the Gauss-Jordan Elimination Calculator.

Orthocenter properties and trivia

Here are some interesting orthocenter properties:

The orthocenter is the intersection of the three altitudes of a triangle.
In an acute triangle, the orthocenter lies inside the triangle.
In an obtuse triangle, the orthocenter lies outside the triangle.
In a right triangle, the orthocenter is located at the right-angle vertex.
The orthocenter lies on the Euler line, along with the centroid and circumcenter.
The nine-point circle of a triangle also relates closely to the orthocenter.

These properties make the orthocenter an important concept in analytic geometry and triangle properties.

Some Commonly Asked Questions Regarding Orthocenter

The following are some questions commonly asked by students regarding the orthocenter:

What is the orthocenter of a triangle?

The orthocenter of a triangle is the point where the three altitudes intersect. Each altitude is drawn from a vertex perpendicular to the opposite side of a triangle.

What is the formula to calculate the orthocenter of the triangle?

There is no single direct orthocenter of a triangle formula. The orthocenter is determined by finding the intersection of two perpendicular altitudes using coordinate geometry equations.

Is orthocenter and circumcenter the same?

No, the orthocenter and circumcenter are different triangle centers. The circumcenter is the intersection of the perpendicular bisectors of the triangle's sides, while the orthocenter is the intersection of the altitudes.

Is the orthocenter equidistant from the vertices?

No, the orthocenter is not equidistant from the triangle’s vertices. The point that is equidistant from all vertices is the circumcenter, which is the center of the triangle’s circumcircle.

Orthocenter Calculator

Vertex A:

Vertex B:

Vertex C: