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Question
In the given pairs of triangles of figure, applying only ASA congruence criterion, determine which triangles are congruent. Also, write the congruent triangles in symbolic form.

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Solution
In ∆PON and ∆MNO,
NO = ON ...(Common)
∠NOP = ∠ONM = 50° + 40° = 90° ...(Given)
∠ONP = ∠NOM = 50° ...(Given)
∴ ∆PON ≅ ∆MNO ...(ASA criterion)
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