- Geogebra Portfolio3.24.1Spherical Coordinates Demonstration tool.3D Box ProblemAngle Between VectorsLinear TransformationsVisualizing the Lagrange Multiplier Method.Constrained OptimizationLongitude and LatitudeEarth Coordinate SystemAmplitude and Period of Cosine and SineHorizontal Compression of Sine and CosineParametric TorusCommon External Tangents of Two CirclesIncircle of a TriangleTwo Tangents TheoremCyclic Quadrilateral WISHCyclic QuadrilateralsPage 71, Problem 10. Rectangle ABCDPoint P is a weighted average of A and B.Similarity Triangles and TrapTrapezoids and VectorsEvolute of a cycloidSlope Field TemplateDirectional Derivative and the Gradient