Please, can you answer my question ?
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The first is not congruent because 3cm is not equal to 2.5cm.
the second one.
In ∆ ADB and ∆ ACB
AC=DB [2cm]
Angle ACB=angle ADB [90°]
AB=AB[common]
Therefore by RHS Criterion ∆ADB congruent to ∆ACB.
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