If $ABCD$ is a cyclic quadrilateral such that $\angle ABC = 70^\circ$, find the measure of $\angle ADC$.
Options:
- A: 70°
- B: 110°
- C: 90°
- D: 140°
Related Practice Questions:
- Which of the following artifacts, extensively found at Burzahom and Gufkral, specifically indicates that the Neolithic inhabitants of Kashmir practiced sewing animal skins for clothing to survive the harsh winters?
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- The first human colonization of the fertile Ganga plains, as evidenced by archaeological discoveries at Sarai Nahar Rai and Mahadaha, took place during which period?
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