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.)

New Resources

Toroidal Spiral
Graphical solution of ax² + bx + c = k
Triangle Flexer
Drunk Parabola
Trefoil Knot

Discover Resources

"Angry Birds" Game 2
startburst_scalefactor_sa
Visualization of Parabola, Ellipse and Hyperbola
InverseGamma
Adding Vectors Geometrically

Discover Topics

Rhombus
Isosceles Triangles
Arithmetic Mean
Parallelogram
Translation