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If two isosceles triangles have a common...

If two isosceles triangles have a common base, prove that the line joining their vertices bisects them at right angles.

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Too prove=AD bisects BBC at right angles
Proof=2N `/_ABC ans /_ADC`
AB=AC(given)
BD=CD(given)
BC=BC(common)
`/_ABC cong /_ADC(S S S)`
`/_1=/_2`
`In /_ABE and /_ACE`
...
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