Triangles: Theorems and Problems 11
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![Triangles](../geometry/triangles_index_17.jpg) |
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![Rectangle, Midpoint, Concyclic points](../problem/p711_rectangle_concyclic_1.jpg) |
Geometry Problem 711.
Rectangle, Midpoint, Angle, Concyclic Points, Cyclic
Quadrilateral. |
![Parallelogram, Midpoint, Diagonal, Collinear, Metric Relations, Similarity, Congruence](../problem/p710_parallelogram_metric_1.jpg) |
Geometry Problem 710.
Parallelogram, Midpoint, Diagonal, Collinear Points, Metric
Relations, Triangle, Similarity, Congruence. |
![Parallelogram, Midpoints, Diagonal](../problem/p709_parallelogram_metric_1.jpg) |
Geometry Problem 709.
Parallelogram, Midpoint, Diagonal, Metric Relations,
Triangle. |
![Triangle, Excenter, Angle](../problem/p707_excenters_angles_1.jpg) |
Geometry Problem 707.
Triangle, Excenters, Angle Bisectors, Angle, Measurement. |
![Triangle, 3 Circumcenters, Concyclic, Cyclic quadrilateral](../problem/p706_cyclic_quadrilateral_1.jpg) |
Geometry Problem 706.
Triangle, Cevian, Three Circumcenters, Circumcircles,
Concyclic Points, Cyclic quadrilateral. |
![Orthocenter, triangle, midpoint, perpendicular](../problem/p704_orthocenter_triangle_1.jpg) |
Geometry Problem 704.
Triangle, Orthocenter, Altitude, Midpoint, Perpendicular. |
![Triangle, Incircle, Diameter](../problem/p703_triangle_incircle_1.jpg) |
Geometry Problem 703.
Triangle, Incircle, Tangency point, Diameter, Congruence. |
![Trianglr, Circumcicle, Concyclic](../problem/p702_circles_angles_1.jpg) |
Geometry Problem 702.
Triangle, Circumcircle, Parallel, Concyclic Points. |
![Equilateral triangle, Circle](../geometry/p700_equilateral_triangle_1.jpg) |
Geometry Problem 700.
Equilateral Triangle, Circle, Circular Segment, Midpoint of
a side, Metric Relations. |
![Equilateral triangle, Circle](../geometry/p699_equilateral_triangle_1.jpg) |
Geometry Problem 699.
Equilateral Triangle, Circle, Circular Segment, Midpoint,
Metric Relations. |
![Quadrilateral, 120 degrees, Angles](../geometry/p698_triangle_120_degrees_1.jpg) |
Geometry Problem 698.
Quadrilateral, Diagonal, Angle Bisector, Triangle, 120
Degrees. |
![Square, Circle, Area](../geometry/p697_square_circle_area_1.jpg) |
Geometry Problem 697.
Square, Circle, Sector, Segment, Tangent, Inscribed,
Congruence, Mind Map, Polya. |
![Circle, Square, Area](../geometry/p696_triangle_angle_1.jpg) |
Geometry Problem 696.
Triangle, Angles, Auxiliary Construction, Congruence, Mind
Map, Polya. |
![Circle, Square, Area](../geometry/p695_triangle_angle_1.jpg) |
Geometry Problem 695.
Triangle, Angles, Auxiliary Construction, Congruence, Mind
Map, Polya. |
![Circle, Square, Area](../geometry/p694_triangle_angle_1.jpg) |
Geometry Problem 694.
Triangle, Angles, 30 Degrees, Auxiliary Construction, Mind
Map, Polya. |
![Isosceles triangle 80, 20, 20 degrees](../geometry/p691_isosceles_80_degree_1.jpg) |
Geometry Problem 691.
Isosceles Triangle, 80-80-20 Degrees, Angles, Congruence,
Mind Map, Polya. |
![Distance between the incenter to the centroid](../center/distance_incenter_centroid_.jpg) |
Problem 690: Distance between the Incenter and the
Centroid of a Triangle.
Formula in terms of the sides a,b,c. |
![Triangle, Excircles, Tangent, Concurrency](../geometry/p689_triangle_excircles_1.jpg) |
Geometry Problem 689.
Triangle, Three Excircles, Tangency points, Tangent lines,
Concurrent Lines, Mind Map. |
![Geometry Problem 688, Triangle, 60 Degrees, Mind Map](../geometry/p688_triangle_60_degree_1.jpg) |
Geometry Problem 688.
Triangle, Angles, 10, 20, 30, 40, 60 Degrees, Measure, Mind
Map, Polya. |
![Triangle, Excircles, COncurrency](../geometry/p687_triangle_excircles_1.jpg) |
Geometry Problem 687.
Triangle, Three Excircles, Tangency points, Concurrent Lines. |
![Triangle, Excircles, Tangent](../geometry/p686_excircles_tangent_1.jpg) |
Geometry Problem 686.
Triangle, Three Excircles, Tangency points, Tangent lines,
Semi-perimeter, Congruence. |
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