Perpendicular Intersections 2

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In the picture Angle ADC and Angle BDC are congruent. What other details do we know about Angle ADC and Angle BDC? What relationship does Line AB and Line DC have?

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רישום חופשי
Bride of the Nile
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Newton disc
Domino Chain Reaction

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Laurenn w
Angles 2
Parabolas and Vertex Form
Visualizing parametric equations
pag. G86 n. 4 (terzo)

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Arithmetic Operations
Geometric Mean
Logic
Circle
Fractal Geometry