Challenge Construction

Author:Elizabeth McCollum

It seems that when D is inside the circle, the locus of C and E is an ellipse. It seems that when D is outside the circle, the locus of C and E is a hyperbola. It also seems that A and D are the foci of the ellipse.

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Riemann Sums
Tangent Vector (2)
z`]]
Transforming Random Variables
Combining Random Variables

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The Doppler Effect with Sound
Transformation of function2
Cylindrical Coordinate System
Cyclic Quadrilaterals
Finding Area Using Sine

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Planes
Circumcircle or Circumscribed Circle
Orthocenter
Pyramid
Means