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प्रश्न
Prove that in an isosceles triangle the altitude from the vertex will bisect the base.
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उत्तर
Now in ΔABD and ΔADC
AB = AC
AD = AD
∠B = ∠C
Therefore, ΔABD ≅ ΔADC ...(SSA criteria)
Hence, BD = DC
Thus, AD bisects BC.
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