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High School Geometry
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Demonstrations 121  140 of 309
Cofunction Identities for Sine and Cosine
Napoleon's Theorem
Area of a Parallelogram
Ptolemy's Theorem
Euclid's Proof of the Pythagorean Theorem
The Perpendicular Bisector of a Chord
The Carpets Theorem
The Midpoint Quadrilateral Theorem
A Theorem about Two Tangent Circles
Crossed Ladders Theorem
Pythagoras Tree
Decomposition of the Tetrahedron into Four Congruent Symmetrical Parts
Bottema's Theorem
Hjelmslev's Theorem
Bennett's OctagontoSquare Dissection
Viviani's Theorem
The ThreeChord Lemma
The Chordal Theorem
Secant Intersection with Two Internally Tangent Circles
How the Altitude Divides the Hypotenuse
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