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Online Geometry: Similarity, Ratios, Proportions.
Theorems and Problems. Page 4 of 5
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Archimedes' Book of Lemmas.
Proposition 7, Similarity of Areas.
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Archimedes' Book of Lemmas.
Proposition 10, Circle, Tangents,
Chord, Parallel
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Archimedes' Book of Lemmas.
Proposition 11, Perpendicular chords
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I have
used Geometry Expressions, the world's first Interactive
Symbolic Geometry System, to visualize the Archimedean Twins and
check out a variety of conjectures.
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Geometry Problem 624
Triangle, Incenter, Excenter, Incircle, Excircle, Similarity. |
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Proposed Problem 131. Van Aubel
Theorem, Concurrent Cevians, Sum of Ratios.
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Proposed Problem 130. Triangle,
Concurrent Cevians, Sum of Ratios.
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Proposed Problem 129. Triangle,
Concurrent Cevians, Sum of Ratios.
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Proposed Problem 128. Incenter of
a Triangle, Angle Bisectors, Sum of Ratios.
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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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Marion
Walter's Theorem: Triangle and Hexagon areas:
Using TracenPoche Dynamic Geometry Software |
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PProposed
Problem 125. Area of Triangle,
Star, Trisection of Sides.
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PProposed 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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Proposed Problem 103.Equilateral
Triangle Area, Interior Point, Heron's Formula.
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Proposed Problem 79: Triangle.
Similarity, Altitudes, Orthocenter, Incircles, Inradii. |
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