Question

9. DIn the given fig. A AOB ~ A DOC - Prove that AB || CD.​

Answer 1

AB∥CD ( given )

In △AOB and △DOC,

∠AOB=∠DOC (Vertically opposite angles)

∠OAB=∠ODC (Alternate angles)

∠ABO=∠DCO (Alternate angles)

From AAA (angle-angle-angle) similarity theorem,

△AOB∼△DOC

Answer 2

Refer to the attachment