Triangles: Theorems and Problems 21
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![Triangles](../geometry/triangles_index_17.jpg) |
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![Elearning 260: Problem about equilateral triangle](../problem/p260_equilateral_triangle_1.jpg) |
Proposed Problem
260.
Equilateral Triangle, Incircle, Tangency Points, Vertices, Distances, Squares.
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![Elearning 259: Equilateral triangle, Incircle](../problem/p259_equilateral_triangle_1.jpg) |
Proposed Problem
259.
Equilateral Triangle, Incircle, Tangency Points, Side, Distances, Squares.
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![Elearning 258: Equilateral triangle, Incircle](../problem/p258_equilateral_triangle_1.jpg) |
Proposed Problem
258.
Equilateral Triangle, Circumcircle, Point, Vertices, Side, Distances,
Squares.
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![Problem 257: Equilateral triangle, circumcircle](../problem/p257_equilateral_triangle_1.jpg) |
Proposed Problem
257.
Equilateral Triangle, Circumcircle, Point, Vertices, Side, Distances,
Squares.
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![Elearning 256: Equilateral triangle](../problem/p256_equilateral_triangle_1.jpg) |
Proposed Problem
256.
Equilateral Triangle, Circumcircle, Point, Vertices, Distances.
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![Problem 254: Triangle and Centroid](../problem/p255_triangle_centroid_17.jpg) |
Proposed Problem
255.
Triangle, Centroid, Vertices, a Point, Distances, Squares.
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![Elearning 254: Triangle and Centroid](../problem/p254_triangle_centroid_17.jpg) |
Proposed Problem
254.
Triangle, Centroid, Vertices, a Point, Distances, Squares.
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![Elearning 253: Triangle, Centroid](../problem/p253_triangle_centroid_17.jpg) |
Proposed Problem
253.
Triangle, Centroid, Vertices, Distances, Squares.
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![Rectangle, Isosceles Right Triangle, Square, Area](../problem/p252_rectangle_area_17.jpg) |
Proposed Problem
252.
Parallelogram, sides, diagonals, squares, areas.
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![Triangle sides, medians, squares](../problem/p249_triangle_medians_17.jpg) |
Proposed Problem
249.
Triangle sides, medians, squares.
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![Elearning: Napoleon Theorem III](../problem/p248_napoleon_theorem_17.jpg) |
Proposed Problem
248.
Napoleon's Theorem III. Inner and outer Napoleon triangles, Area.
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![Napoleon Theorem II](../problem/p247_napoleon_theorem_17.jpg) |
Proposed Problem
247.
Napoleon's Theorem II. Internal Equilateral triangles. Inner Napoleon
triangle.
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![Napoleon Theorem I](../problem/p246_napoleon_theorem_17.jpg) |
Proposed Problem
246.
Napoleon's Theorem I. External Equilateral triangles. Outer Napoleon
triangle.
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![Elearning 245: Parallelogram](../problem/p245_parallelogram_equilate.jpg) |
Proposed Problem
245. Parallelogram with Equilateral triangles
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![Elearning 243](../problem/p243_equilateral_triangle_1.jpg) |
Proposed Problem
243. Triangle with Equilateral triangles, Parallelogram.
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![Elearn 242: Equilateral triangle and parallelogram](../problem/p242_equilateral_triangle_1.jpg) |
Proposed Problem
242. Triangle with Equilateral triangles, Parallelogram.
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![Equilateral triangle, congruence SAS](../problem/p241_equilateral_triangle_1.jpg) |
Proposed Problem
241. Triangle with Equilateral triangles, Congruence.
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![Triangle with equilateral triangles](../problem/p240_equilateral_triangle_1.jpg) |
Proposed Problem
240. Triangle with Equilateral triangles, Parallelogram.
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![Square, Midpoint, Congruence, Pythagoras](http://gogeometry.com/
problem/p239_square_midpoint_17.jpg) |
Proposed Problem
239. Square, Midpoints, Lines, Congruence, Pythagoras.
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![Square. Midpoint, Congruence](http://gogeometry.com/
problem/p238_square_midpoint_17.jpg) |
Proposed Problem
238. Square, Midpoints, Lines, Congruence.
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