Online Geometry: Triangles, Theorems and Problems

Online Geometry

Triangles Theorems and Problems- Page 30

Triangles

Elearn 127: Centroid, Incenter

Proposed Problem 127. Centroid and Incenter of a Triangle, Parallel, Proportions.

Elearn 126: Incenter Proportions

Proposed Problem 126. Incenter of Triangle, Angle Bisector, Proportions.

Angle Bisector Theorem

Euclid's Elements Book VI, Proposition 3: Angle Bisector Theorem

Pythagoras Theorem, 47th Proposition of Euclid's Book I

The significance of the Pythagorean theorem  by Jacob Bronowski.
Pythagorean Theorem, 47th Proposition of Euclid's Book I.

Elearning 125: Area

Proposed Problem 125. Area of Triangle, Star, Trisection of Sides.

Elearning 124: Triangle Area, Similarity

Proposed Problem 124. Area of triangle, Similarity, Trisection of Sides.

Elearning 123: Triangle Similarity, Area

Proposed Problem 123. Area of triangle, Similarity, Trisection of Sides.

Marion Walter's Theorem

Proposed Problem 122. Marion Walter's Theorem. Area of triangle and Hexagon, Trisection of Sides.

Elearning 121: Similarity and Area

Proposed Problem 121. Similarity and Area of triangle, Trisection of Sides.

Bottema Theorem. Elearning.

Bottema's Theorem:
Triangle and Squares with Interactive Geometry Software
Step-by-Step construction, Manipulation, and animation.

Complete quadrilateral: ortholine, Elearning

Complete Quadrilateral: Ortholine-Steiner Line.
Step-by-Step construction, Manipulation, and animation

Problem 120: Triangle area. Elearning.

Proposed Problem 120. Area of triangle, incenter, excircles, tangent.

Elearn 119: Triangle area.

Proposed Problem 119. Area of triangle, incenter, excircle, tangent.

Problem 118

Proposed Problem 118. Area of triangle, incenter, excenter, tangent.

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