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Question

In the adjoining figure, AB = CD and AD = BC. Show that 1=2
558474_dd73de28f26a44ea884f7e6b52edcac8.png

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Solution

In triangles ABD and CDB,

We have
AB=CD (Given)
AD=BC (Given)
BD=DB (common side)

Hence, ABDCDB, by SSS postulate.

Comparing the angles of the congruent triangles

we get ADB=CBD

1=2

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