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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Area of a Trapezoid
Untitled
Focus and Directrix
Sum of Squares: Proof without Words
bewijs stelling van Pythagoras

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Quadrilateral project
Páros
X & Y Intercepts
สามเหลี่ยม วงกลม
Поворот

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Incircle or Inscribed Circle
Addition
Dilation
Tangent Function
Limits