# Geometry Angles,Theorems and Problems - 4

Proposed Problem 376.
Triangle, Excenter, Internal and External Angle Bisectors.

Proposed Problem 375.
Triangle, Excenter, External Angle Bisectors.

Proposed Problem 374.
Triangle, Incenter, Internal Angle Bisectors.

Proposed Problem 373.
Square, Inscribed Circle, Diagonal, Perpendicular, Angle.

Proposed Problem 372.
Circles, Common Internal and External Tangent, Angles.

Proposed Problem 363.
Right triangle, Congruence, Angles.

Proposed Problem 361.
Right triangle, Incircle, Incenter, Tangency points, Angle.

Proposed Problem 358.
Isosceles triangle 80-80-20, Circle, Angles, Congruence.

Proposed Problem 354.
Rhombus, Square, 45 degrees.

Proposed Problem 350.
Triangle, Cevian, Incircles, Tangents, Tangency Point, Angles.

Proposed Problem 274.
Isosceles Triangle, 80-80-20, Angles.

Proposed Problem 216. Quadrilateral, Angle Bisectors, and Concurrency.

Proposed Problem 215. Quadrilateral, Angle Bisectors, and Cyclic Quadrilateral.

Proposed Problem 208. Triangle, Excircles, Angles, 360 degrees.

Proposed Problem 199. Triangle, Quadrilateral, Angles.

Proposed Problem 198. Triangle, Quadrilateral, Angles.

Proposed Problem 187. Right Triangle, Altitude, Incenters, Circles, Angles.

Proposed Problem 185. Trapezoid, Triangles and Angles.

Proposed Problem 184. Triangle and Angles.

Proposed Problem 182. Overlapping Circles, Find an angle.

Proposed Problem 181. Circular Sector of 90 degrees, find an angle.

Proposed Problem 179. Rhombus, Square, Diagonal, Angle.

Proposed Problem 134. Orthic Triangle, Altitudes, Angle Bisectors, Orthocenter, Incenter.

Proposed Problem 133. Triangle, Angle Bisectors, Collinear Points.

Proposed Problem 128. Incenter of a Triangle, Angle Bisectors, Sum of Ratios.

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

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

Proposed Problem 111. Orthogonal Circles (two circles that are perpendicular at their intersection).

Proposed Problem 109. Angles, Right Triangle, Cevian.

Proposed Problem 108. Angles, Triangle, Median.

Proposed Problem 107. Angles, Triangle. Cevian.

Proposed Problem 106. Angles, Triangle. Cevian.

Proposed Problem 105.Angles, Triangle. Interior Point.

Proposed Problem 104. Angles, Triangle.

Proposed Problem 101.Equilateral Triangle, Pythagorean Theorem, Angles.

Proposed Problem 1: Angles of a Triangle. Midpoint, Congruence. Hints are provided.

Proposed Problem 13: Angles of a Triangle. Hints are provided.

Proposed Problem 77: Angles of a Circle. Parallel lines, Cyclic quadrilateral.

Proposed Problem 74: Three Intersecting Circles. Cyclic quadrilateral, Angles.

Proposed Problem 73: Three Intersecting Circles. Cyclic quadrilateral. Angles.

Proposed Problem 72: Intersecting Circles. Cyclic quadrilateral, Chords, Parallel. Angles.

Proposed Problem 71: Cyclic Quadrilateral. Angles

Proposed Problem 60: Isosceles triangle and angles.

Proposed Problem 57: Angle bisector, circles Cyclic Quadrilateral.

Proposed Problem 56: Angle bisector, circles Parallel Lines.

Proposed Problem 55: Angle bisector, circles Cyclic Quadrilateral.

Proposed Problem 54: Angle bisector, circles Midpoint of arc.

Proposed Problem 50. Triangle with Equilateral triangles.
Seventeen conclusions. Angles

Proposed Problem 49. Angles and right triangle.

Proposed Problem 48. Angles and triangles.

Proposed Problem 47. Angles and triangles.

Proposed Problem 46. Angles and triangles.

Proposed Problem 45. Angles and triangles.

Proposed Problem 44. Angles and triangles.

Proposed Problem 43. Angles and triangles.

Proposed Problem 42. Angles and triangles.

Proposed Problem 40.
Triangle, Incenter, Excenter, Angles 80, 40, Distances.

Proposed Problem 39.
Triangle, Incircle, Bisector, Cyclic Quadrilateral and angles.

Proposed Problem 38.
Right Triangle, altitude, incircles, incenters, and angles.

Proposed Problem 37.
Right Triangle, altitude, incircles, incenters, orthocenter, and angles.

Proposed Problem 33.
Triangle and quadrilateral. Angles.

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