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Relation between internal bisectors of angles A, B, and C of a triangle and its sides

An angle bisector divides the angle into two angles with equal measures. An angle only has one bisector. Each point of an angle bisector is equidistant ... more

Pengâ€“Robinson equation of state

The Pengâ€“Robinson equation of state (PR EOS) was developed in 1976 at The University of Alberta by Ding-Yu Peng and Donald ... more

Prandtlâ€“Meyer expansion fan - final flow density

A supersonic expansion fan, technically known as Prandtlâ€“Meyer expansion fan, is a centred expansion process that occurs when a supersonic flow turns ... more

Prandtlâ€“Meyer expansion fan - final flow tempreture

A supersonic expansion fan, technically known as Prandtlâ€“Meyer expansion fan, is a centred expansion process that occurs when a supersonic flow turns ... more

Prandtlâ€“Meyer expansion fan - final flow pressure

A supersonic expansion fan, technically known as Prandtlâ€“Meyer expansion fan, is a centred expansion process that occurs when a supersonic flow turns ... more

Sum of the ratios on the three altitudes of the distance of the orthocenter from the vertex to the length of the altitude

Altitude of a triangle is a line segment through a vertex and perpendicular to a line containing the base (the opposite side of the triangle). This line ... more

Menelaus' theorem ( transversal line passes inside triangle )

Menelaus’ theorem, named for Menelaus of Alexandria, is a theorem about triangles in plane geometry. Given a triangle ABC, ... more

Ceva's theorem (lines from vertices to the opposite sides of a triangle)

Ceva’s theorem is a theorem about triangles in Euclidean plane geometry. Given a triangle ABC, let the lines AO, BO and CO ... more

Sum of the ratios on the three altitudes of the distance of the orthocenter from the base to the length of the altitude

Altitude of a triangle is a line segment through a vertex and perpendicular to a line containing the base (the opposite side of the triangle). This line ... more

Law of Conservation of Mechanical Energy - General version

Energy can be neither created nor destroyed.
Total energy is constant in any process. It may change in form or be transferred from one system to ... more

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