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I nailed it Mr. Nelson #11
Author:
nelsone
The altitudes of any triangle meet at a single point called the ORTHOCENTER. (An altitude is the perpendicular line segment from a vertex of a triangle to the opposite side of the vertex.)
GeoGebra
New Resources
centripetal force
探究長方形對角線上的正方形數目
Experiments with Transformations in the Plane
Roll Dice
Flip 9 Coins
Discover Resources
(B) Slippery Slopes: Deriving the Derivative
Task B Q1
Bragg Reflection Demonstration
Discover Topics
Plane Figures or Shapes
Rectangle
Square
Prism
Rotation