Question

In angle ABC , angle A=angle BC find angle A what kind of triangle is it​

Answer 1

Answer:

In △ABC,∠BAD+∠ADB+∠DBA=180∘ by angle sum property of a triangle.

50∘+90∘+∠DBA=180∘

⇒∠DBA=180∘−140∘=40∘

∴∠B=40∘