In the given figure,
and AB = 5 cm. Find the value of DC.

In
AOB and
COD,
∠ AOB = ∠COD (Vertically opposite angles)
(given)
Therefore according to SAS similarity criterion,
∴
AOB ~
COD
Since, triangles are similar, hence corresponding sides will be proportional
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⇒ DC = 10cm
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