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Four orthocenters lie on a circle
Author:
Poliagapitos
GeoGebra
New Resources
Reflection Across 2 Parallel Lines
Exploring GeoGebra for the First Time
Prism Drawn in 1-Point Perspective
Triangle with 3 Right Angles
Reflection = 180° Rotation about a Line
Discover Resources
Parallel Lines by Angle Copy
diagram3
Circumcenter
Peterson 1
Discover Topics
Combinatorics
Volume
Right Triangles
Logarithmic Functions
Upper and Lower Sum or Riemann Sum