# Altitude of a Triangle, Theorems and Problems - Table of Content 3

Geometry Problem 629
Triangle, Perpendicular to Sides, Intersecting Lines, Altitude.

Geometry Problem 613
Altitude of a Triangle, Perpendicular, Collinear Points.

Geometry Problem 612
Altitude of a Triangle, Perpendicular, Congruence.

Geometry Problem 611
Altitude of a Triangle, Perpendicular, Collinear Points, Parallel.

Geometry Problem 594.
Triangle, Incenter, Incircle, Inradius, Tangency Point, Midpoint, Altitude, Angle, Half the Difference.

Geometry Problem 591.
Triangle, Incenter, Incircle, Inradius, Tangency Point, Midpoint, Altitude.

Problem 515.
Triangle, Double Angle, Altitude, Measure.

Proposed Problem 427.
Triangle, Two Altitudes, Square of a Side.

Proposed Problem 420.
Triangle, Altitude, Angles, Sides, Measurement.

Proposed Problem 414.
Triangle, Angles, Altitude, Median, Congruence.

Proposed Problem 413.
Cyclic Quadrilateral, Orthocenter, Parallelogram, Concurrency, Congruence.

Proposed Problem 397.
Triangle, Altitude, Midpoints, Congruence.

Proposed Problem 393.
Triangle, Orthocenter, Altitude, Circumcircles, Congruence, Collinear.

Proposed Problem 347.
Triangle, Altitude, Perpendicular, Circle, Concyclic points.

Proposed Problem 334.

Proposed Problem 329.
Triangle, Altitudes, Circle, Diameter, Concyclic points.

Proposed Problem 325.
Isosceles triangle, Altitude, Cevian, Incircle, Excircle.

Proposed Problem 321.
Triangle, Incenter, Excircle, Midpoint of the Altitude, Collinearity.

Proposed Problem 319.
Triangle, Altitudes, Perpendiculars, Collinear points.

Proposed Problem 318.
A Scalene triangle, Altitudes, Collinear points.

Arithmetic Mean, Geometric Mean, Harmonic Mean, Root Mean Square.
Altitude of a right triangle.

Proposed Problem 269.
Right Triangle, Altitude, Perpendicular, Projection.

Proposed Problem 268.
Right Triangle, Catheti and Altitude.

Proposed Problem 266.
Right Triangle, Altitude, Geometric Mean.

Proposed Problem 264.
Right Triangle, Altitude, Leg projection, Hypotenuse, Similarity, Geometric mean.

Proposed Problem 263.
Triangle, Median, Altitude, Orthogonal Projection, Sides.

Proposed Problem 222. Viviani's theorem, Equilateral triangle, Exterior point, Distances, Altitude.

Proposed Problem 221. Viviani's theorem, Equilateral triangle, Interior point, Distances, Altitude.

Proposed Problem 220. Right Triangle, Altitude, Angle Bisector, Distance, Arithmetic Mean.

Proposed Problem 218. Right triangle, Altitude and Projections.

Proposed Problem 217. Right triangle, Altitude and Projections.

Proposed Problem 199. Triangle, Altitude, Quadrilateral, Angles.

Proposed Problem 191. Triangle, Altitudes, Orthocenter, Squares, Areas.

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

Proposed Problem 186. Right Triangle, Altitude, Incenters, Circles.

Proposed Problem 186. Right Triangle, Altitude, Incenters, Circles.

Proposed Problem 139. Triangle Area, Altitudes, Orthic Triangle, Semiperimeter, Circumradius.

Proposed Problem 138. Nagel's Theorem, Altitudes, Orthic Triangle, Circumradius, Perpendicular.

Proposed Problem 137. Orthic Triangle, Altitudes, Perpendicular, Incircle, Collinear Points, Parallelogram.

Proposed Problem 136. Orthic Triangle, Altitudes, Perpendicular, Concyclic Points.

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