Math: Geometry: What's New, Recent Additions, College, High School, Kids - Page 130

The Thirteen Towers of Chankillo, Peru.
Stone Towers Are Decoded as Earliest Solar Observatory in the Americas.

Mascheroni Construction with compass alone. Midpoint of a segment.

Proposed Problem 50. Triangle with Equilateral triangles.
Seventeen conclusions.

Proposed Problem 49. Angles and right triangle.

Proposed Problem 48. Angles and triangles.

Proposed Problem 47. Angles and triangles.

Proposed Problem 46. Angles and triangles.

Proposed Problem 45. Angles and triangles.

Proposed Problem 44. Angles and triangles.

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