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.)

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探究長方形對角線上的正方形數目
Example of using color palette
Conchoids of Nicomedes

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Constructing limacon and cardiod.
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Geogebra Polar Grapher4
AM42EB2_LC_DEMO_CH12_003_Enlargement
Costs-Revenue
Translate: Two Steps

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Rotation
Parametric Curves
Frequency Distribution
Mode
Differential Equation