Question

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Answer 1

Step-by-step explanation:

We can extract two triangles, ABD and ADC.

In triangle ABC and ADC,

AB=AC (ABC is isosceles)

angle ADB= angle ADC ( AD is an altitude )

angle BAD = angle CAD (ABC is isosceles)

Thus, by the rule of ASA, ∆ABD = ∆ADC.

So, CB=CD (CPCT)

Thus, AD bisects BC.

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