Altitude of a Tetrahedron Given Its Edges
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This Demonstration constructs an altitude of a tetrahedron given its edge lengths , , , , , , . (In the figure, the edge length of is .) Suppose the altitude is from vertex to the opposite face . First, construct the net of with the triangle in the center (unfold completely). Normals from the vertex to the sides , , meet at a point . This is the 3D orthogonal projection of vertex . In 3D, the lines , and the altitude form a right triangle with as its hypotenuse. So we can construct the altitude as a leg of the triangle.
Contributed by: Izidor Hafner (March 2017)
Open content licensed under CC BY-NC-SA
"Altitude of a Tetrahedron Given Its Edges"
Wolfram Demonstrations Project
Published: March 27 2017