Online Geometry

Geometry: Incenter, Incircle, Inradius of a triangle, Theorems and Problems.

Incenter, Incircle, Index


Elearning 117 Areas

Proposed Problem 117. Area of triangle, incenter, excircles, tangent.

Elearning 114: Area

Proposed Problem 114. Area of triangle, incenter, incircle, excircle.

Elearning 113: Areas

Proposed Problem 113. Area of triangle, incenter, incircle, excircle.

Contact Triangle Area. Elearning.

Proposed Problem 110. Area of Contact Triangle. Incenter, Incircle.

Elearning 96

Proposed Problem 96. Similar Triangles, Incenters, Parallelogram.

Problem 95, Elearning

Proposed Problem 95. Similar Triangles, Inradii, Parallel.

Intouch and Extouch Triangles. Puzzle cut: 20 Piece Classic
Based on Proposed Problem 86.

Proposed Problem 86. Intouch and Extouch Triangles, Areas.

Contact Triangles. Puzzle cut: 22 Piece Polygons
Based on Proposed Problem 85.

Proposed Problem 85. Contact Triangles Areas, Incircle, Excircle.

Proposed Problem 84. Contact Triangles Areas, Incircle, Excircle, Inradius, Exradius.

Contact triangle area

Proposed Problem 82. Area of the Contact Triangle, inradius, circumradius.

Triangle area

Proposed Problem 81. Area of a triangle, side, incircle, incenter, inradius, circumradius.

Proposed Problem 80. Area of a triangle, side, incircle, incenter,, inradius.

Problem 79: Triangle. Similarity, Altitudes, Orthocenter, Incenter, Incircles, Inradii.

Proposed Problem 68

Proposed Problem 68: Triangle, Incircle, Inradius, Tangent, Similarity.

Proposed Problem 64: Triangle, Incircle, Transversal.

Proposed Problem 52: Triangle, angles, incircle.

Puzzle: Sangaku Problem. Incircles, incenters,

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