Nazca Lines: The Monkey - Puzzle.
Nazca Lines: The Condor bird. Puzzle: 40 pieces of birds tessellation.
Nazca Lines: The Spider. Puzzle: 44 pieces in a tri-dove style of piece.
Nagel Point Theorem. Proof.
Puzzle of the Nagel Point: 22 pieces of polygons.
Nagel Point Theorem - Flowchart Proof .
Semiperimeter and excircles of a triangle.
Semiperimeter and incircle of a triangle.
Semiperimeter, incircle and excircles of a triangle.
Gergonne Point Theorem. Concurrency. Interactive proof with animation.
Key concept: Ceva's Theorem.
Ceva's Theorem. Concurrency. Interactive proof with animation. Key concept: Menelaus Theorem.
Puzzle of the Ceva's Theorem: 48 classic piece.
Menelaus' Theorem. Interactive proof with animation and key concepts.
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