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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Circumference of a unit circle
רישום חופשי
The Geometry of the Coefficients of a Quadratic Function
Rolling a Square
အခြေခံ data အခေါ်အဝေါ်များ

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Brooke Pennington
均分除法（分數÷整數）_教學建議
Cubic Roots
Finding Area Using Sine
Finding critical points (on a sphere) of a function of sum of the squares of the distances - for n points in ℝ³

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Secant Line or Secant
Similar Triangles
Reflection
Special Points
Equilateral Triangles