Menelaus' Theorem Proof - Triangle line transverse. Online Geometry Tutoring

Menelaus of Alexandria (70-130) was one of the later Greek geometers who applied spherical geometry to astronomy. He is best known for the so-called Menelaus' theorem.

See also:

1.		Ceva's Theorem. Concurrency. Interactive proof with animation. Key concept: Menelaus Theorem. Puzzle of the Ceva's Theorem: 48 classic piece.
2.		Pascal's Mystic Hexagram Theorem Proof
3.		Blanchet Theorem
4.		Nagel Point Theorem. Proof.
5.		Nagel Point Theorem - Flowchart Proof .
6.		Gergonne Point Theorem. Concurrency. Interactive proof with animation. Key concept: Ceva's Theorem.
7.		Triangle with the bisectors of the exterior angles. Collinearity.Key concept: Menelaus Theorem.
8.		Monge & d'Alembert Three Circles Theorem I with Dynamic Geometry
9.		Monge & d'Alembert Three Circles Theorem II with Dynamic Geometry
10.		Newton's Theorem: Newton's Line. Circumscribed quadrilateral, midpoints of diagonals, center of the circle inscribed. Puzzle of the Newton's Theorem: 50 pieces of circles.
11.		Pentagons & Pentagrams. I found, exploring with dynamic geometry software, new facts about pentagons and pentagrams. Key concept: Menelaus Theorem. See also: Pentagons & Pentagrams - Puzzle: 96 triangles.
12.		Eyeball Theorem: Animated Angle to Geometry Study.
13.		Seven Circles Theorem
14.		Equal Incircles Theorem
15.		Archimedes' Book of Lemmas
16.		Butterfly Theorem
17.		Triangle Centers
18.		Euler and his beautiful and extraordinary formula
19.		Semiperimeter and incircle
20.		Semiperimeter and excircles of a triangle
21.		Semiperimeter, incircle and excircles of a triangle
22.		Miquel's Pentagram with Dynamic Geometry
23.		Miquel's Pentagram Theorem. Proof
24.		Johnson's Theorem
25.		Simson Line
26.		Angle between two Simson Lines
27.		Sangaku Problem
28.		The Bevan Point
29.		Clifford's Circle Chain Theorems
30.		Kurschak's Tile and Theorem
31.		Animated Angle to Geometry Study
32.		Proposed Problem 28 Right Triangle, altitude, incircles and inradius.
33.		Steiner Point

Online Geometry: Menelaus' Theorem, Transversal Line, Triangle. Level: High School, College