Triangles: Theorems and Problems 12
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![Triangles](../geometry/triangles_index_17.jpg) |
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![Isosceles triangl 100-40-40 degrees](../geometry/p685_isosceles_100_degree_1.jpg) |
Geometry Problem 685
Isosceles Triangle, 100-40-40 Degrees, Angles, Congruence. |
![Outer Nagel Point](../geometry/p684_nagel_point_exterior_1.jpg) |
Geometry Problem 684:
Outer Nagel Point.
Triangle, Excircles, Incircle Tangency points, Concurrent lines, Semi-perimeter, Ceva theorem. |
![Nagel Point](../geometry/p683_nagel_point_interior_1.jpg) |
Geometry Problem 683:
Nagel Point.
Triangle, Excircles, Tangency points, Concurrent lines, Semi-perimeter, Ceva theorem. |
![Gergonne Point Theorem](../geometry/p682_gergonne_point_ex_1.jpg) |
Geometry Problem 682: Gergonne External Point.
Triangle, Excircle, Tangency points, Concurrent lines, Semiperimeter, Ceva theorem. |
![Gergonne Point Theorem](../geometry/p681_gergonne_point_in_1.jpg) |
Geometry Problem 681:
Gergonne Point.
Triangle, Incircle, Tangency points, Concurrent lines, Semiperimeter, Ceva theorem. |
![Online education degree: geometry problems](http://agutie.homestead.com/files/problem/geometry_problems_index_1.jpg) |
100 Geometry Problems Collection
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![Triangle, Circle, Median, Proportion](../problem/p679-triangle-circle-1.jpg) |
Geometry Problem 679.
Triangle, Circle, Median, Proportion. |
![Simson Line, Parallel](../problem/p678-simson-line-1.jpg) |
Geometry Problem 678.
Triangle, Simson Line, Circumcircle, Tangent, Parallel, Perpendicular, Collinear Points. |
![Triangle, Altitude, Angles](../problem/p674_triangle_angle_1.jpg) |
Geometry Problem 674.
Triangle, Altitude, Angles. |
![Tangent Circles, Chord, Metric Relations](../problem/p673_tangent_circles_1.jpg) |
Geometry Problem 673.
Internally tangent circles, Chord, Tangent, Metric Relations. |
![Geometry problem: Triangle, Angles, Congruence](../problem/p671_triangle_angles_1.jpg) |
Geometry Problem 671.
Triangle, Cevian, Angles, Congruence. |
![Triangle, 60 Degrees](../problem/p670_triangle_60_degrees_1.jpg) |
Geometry Problem 670.
Triangle, 60 Degrees, Orthocenter, Incenter, Circumcenter, Congruence. |
![Triangle, Circumcircle, Incenter](../problem/p669_triangle_incenter_1.jpg) |
Geometry Problem 669.
Triangle, Circumcircle, Incenter, Midpoint, Collinear points, Mind Map. |
![Right triangle, Incircles](../problem/p668_right_triangle_1.jpg) |
Geometry Problem 668.
Right triangle, Incircles, Parallel, Common Tangent, Mind Map. |
![Triangle, 60 Degrees, Centers, Angles](../problem/p664_triangle_60_degrees_1.jpg) |
Geometry Problem 664.
Triangle, 60 Degrees, Orthocenter, Incenter, Circumcenter, Angles,
Triangle centers. |
![Triangle, 60 Degrees, Concurrent lines](../problem/p663_triangle_60_degrees_1.jpg) |
Geometry Problem 663.
Scalene Triangle, 60 Degrees, Altitude, Angle Bisector, Perpendicular Bisector,
Concurrent lines. |
![Triangle Centers, Angles](../problem/p662_triangle_angle_1.jpg) |
Geometry Problem 662.
Triangle, Incenter, Circumcenter, Orthocenter, Circle, Angle, Measurement. |
![Triangle, Circle, Diameter, Perpendicular](../problem/p660_triangle_circle_1.jpg) |
Geometry Problem 660.
Triangle, Circle, Diameter, Perpendicular Lines. |
![Triangle, Altitudes, Circles, Angles](../problem/p658_triangle_circle_1.jpg) |
Geometry Problem 658.
Triangle, Altitudes, Diameter, Circle, Angles. |
![Triangle, Incircle, Parallel](../problem/p657_triangle_incircle_1.jpg) |
Geometry Problem 657.
Triangle, Incircle, Tangency Points, Parallel Lines,
Congruence. |
![Triangle, Cevian, Concurrent Lines](../problem/p656_triangle_concurrent_1.jpg) |
Geometry Problem 656.
Triangle, Cevian, Concurrent Lines. |
![Triangle, Parallel Lines, Intersecting Lines](../problem/p633_triangle_parallel_1.jpg) |
Geometry Problem 633
Triangle, Parallel Lines, Intersecting Lines. |
![Triangle, Angle Bisectors, Midpoint, Collinear](../problem/p632_triangle_collinear_1.jpg) |
Geometry Problem 632.
Triangle, Interior and Exterior Angle Bisectors, Midpoints, Collinear Points. |
![Triangle, Angle Bisectors, Collinear](../problem/p631_triangle_bisector_1.jpg) |
Geometry Problem 631.
Triangle, Exterior Angle Bisectors, Collinear Points. |
![Clawson Point](../problem/p630_clawson_point_1.jpg) |
Geometry Problem 630: Clawson Point.
Orthic and Extangents Triangles, Concurrent lines. |
![Triangle, Perpendicular, Intersecting Lines](../problem/p629_perpendicular_1.jpg) |
Geometry Problem 629
Triangle, Perpendicular to Sides, Intersecting Lines, Altitude. |
![Triangle, Incenter, Excenter, Distance](../problem/p626_incenter_excenter_1.jpg) |
Geometry Problem 626
Triangle, Distance from the Incenter to an Excenter. |
![Triangle, Parallel, Angle Bisector](../problem/p625_triangle_bisector_1.jpg) |
Geometry Problem 625
Triangle, Parallel Lines, Congruence, Angle Bisector. |
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