Math: Geometry: What's New, Recent Additions, College, High School, Kids - Page 86

Proposed Problem 251.
Parallelogram, sides, diagonals, squares, areas.

Proposed Problem 250.
Quadrilateral, sides, diagonals, midpoints, squares.

Proposed Problem 249.
Triangle sides, medians, squares.

Median length, Apollonius' Theorem

Euclid's Elements Book II, Proposition 12: Law of Cosines.

Euclid's Elements Book II, Proposition 13: Law of Cosines.

Proposed Problem 248.
Napoleon's Theorem III. Inner and outer Napoleon triangles, Area.

Proposed Problem 247.
Napoleon's Theorem II. Internal Equilateral triangles. Inner Napoleon triangle.

Proposed Problem 246.
Napoleon's Theorem I. External Equilateral triangles.

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