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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အခြေခံ data အခေါ်အဝေါ်များ
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Parallelograms
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Secant Secant Segment Relationship
An Introduction to Differentiation
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