Question

pls answers briefly
pls​

Answer 1

Answer:

Given in ∆ABC, the bisector AD of angle A is perpendicular to side BC.

In ∆BAD and ∆CAD,

∆BAD = angle CAD ....Given

angle ADB = angle ADC = 90° ...........(AD is perpendicular to side BC)

AD = AD ...........(Common side)

:∆BAD ~= ∆CAD ........[ASA test]

:AB = AC ............[CSCT]

By converse of isosceles triangle theorem,

:∆ABC is isosceles. [hence proved]

Hope this helps u;)