Sum
In figure, if ∠A = ∠C, then prove that ∆AOB ~ ∆COD
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Solution
In triangles AOB and COD, we have
∠A = ∠C [Given] and, ∠1 = ∠2 [Vertically opposite angles]
Therefore, by AA-criterion of similarity, we have
∆AOB ~ ∆COD
Concept: Similarity
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