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?

Nuevos recursos

Addition of Vectors Algeraically
Variation Theory Illustration: Point-Slope Form
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bewijs stelling van Pythagoras
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Kite Property
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Square spiral Sofia M (RO)
Slope from similar triangles

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