Triangles: Theorems and Problems 30
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Proposed Problem
127. Centroid and Incenter of a Triangle,
Parallel, Proportions.
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Proposed Problem
126. Incenter of Triangle, Angle Bisector, Proportions.
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Euclid's Elements Book VI, Proposition 3: Angle Bisector Theorem |
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The significance of the Pythagorean theorem by Jacob Bronowski.
Pythagorean Theorem, 47th Proposition of Euclid's
Book I. |
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Proposed Problem
125. Area of Triangle, Star,
Trisection of Sides.
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Proposed Problem
124. Area of triangle,
Similarity, Trisection of Sides.
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Proposed Problem
123. Area of triangle,
Similarity, Trisection of Sides.
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Proposed Problem
122. Marion Walter's Theorem.
Area of triangle and Hexagon, Trisection of Sides.
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Proposed Problem
121. Similarity and Area
of triangle, Trisection of Sides.
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Bottema's Theorem:
Triangle and Squares with Interactive
Geometry Software
Step-by-Step construction, Manipulation, and animation. |
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Complete Quadrilateral: Ortholine-Steiner Line.
Step-by-Step construction, Manipulation, and animation |
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Proposed Problem
120. Area of triangle,
incenter, excircles,
tangent.
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Proposed Problem
119. Area of triangle,
incenter, excircle,
tangent.
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Proposed Problem
118. Area of triangle,
incenter, excenter,
tangent.
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