College Geometry Online, eLearning

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

Altitude of a triangle


Triangle, Perpendicular, Intersecting Lines

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

Triangle, Altitude, Collinearity

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

Triangle, Altitude, Congruence

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

Triangle, Altitude, Collinearity

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

Triangle, Incircle, Altitude, Incenter, Angle

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

Triangle, Incircle, Inradius, Altitude, Midpoint

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

Triaangle, Double-angle, Altitude

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

Triangle, Altitudes

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

Triangle, Angle, Altitude, Side, Measurement

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

Triangle, Angle, Median, Altitude, Congruence

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

Cyclic quadrilateral, Orthocenter, Parallelogram, Congruence

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

Triangle, Altitude

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

Triangle, Orthocenter

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

Triangle, Altitude, Circle, Concyclic points

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

Problem 334 Cyclic Quadrilateral, Perpendiculars to Diagonals

Proposed Problem 334.
Cyclic Quadrilateral, Perpendiculars to Diagonals.

Triangle, Altitudes, Concyclic Points

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

Isosceles triangle, Altitude, Incircle, Excircle

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

Triangle, Incenter, Excircle, Altitude, Collinear

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

Triangle, Altitude

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

Elearning 318

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

Geometric, Arithmetic, Harmonic Mean Relationship

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

Right triangle, Altitude, perpendiculars

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

Right triangle, Altitude, Catheti

Proposed Problem 268.
Right Triangle, Catheti and Altitude.

Right triangle, Altitude, Geometric Mean

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

Right triangle

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

Problem 263: Triangle, Median Projection

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

Viviani theorem, Equilateral triangle, exterior point

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

Viviani's theorem I

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

Right triangle, inradius, altitude, arithmetic mean

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

Elearn 218: Right triangle

Proposed Problem 218. Right triangle, Altitude and Projections.

Elearn 217: Right triangle, Altitude, Projections

Proposed Problem 217. Right triangle, Altitude and Projections.

Problem: Triangle, Altitude, Angles

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

Geometry Problem 191 about triangle and squares

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

Elearning 187: Right triangle, incircles, angles

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

Elearning 186: Right triangle, circles

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

Elearning 186: Right triangle, circles

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

Elearning 139: Triangle Area

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

Nagel Theorem

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

Geometry Problem 137

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

Geometry Problem 136

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

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