Math: Geometry: What's New, Recent Additions, College, High School, Kids - Page 76

Proposed Problem 295.
Archimedean Twin Circles, Arbelos, Semicircles, Harmonic Mean, Radii, Perpendicular.

Soddy Circles and Descartes Theorem.
Three tangent circles, Inscribed and Circumscribed Circles, Radii.

Proposed Problem 294.
Right triangle, Circumcenter, Excenter, Hypotenuse, Perpendicular.

Excenter. Index.
Excircle, Exradius.

Parallel lines.
Theorems and Problems.

Proposed Problem 293.
Inscribed Quadrilateral, Perpendicular, Rectangle, Isosceles Right triangle, Area, Similarity.

Proposed Problem 292.
Triangle, Parallel, Congruence, Similarity.

Proposed Problem 291.
Triangle, Circle, Circumradius, Perpendicular.

Euclid's Elements, Book X, Lemma for Proposition 33
One page visual illustration.

Proposed Problem 290.
Internally Tangent circles, Radius, Perpendicular, Tangent.

TracenPoche Interactive Geometry Software Applications.

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