Question

in ∆ABC AB=AC and D is interior of ∆ABC such that angleDBC=angleDCB
then which relation is not true,​

Answer 1

Answer:

Step-by-step explanation:

In △ABD,

∠ADB+∠A+∠ABD=180  

o

 

⇒∠ADB+36+36=180  

o

 

⇒∠ADB=180−72=108  

o

 

In an isosceles triangle , opposite to equal sides are equal. In a triangle, one side is extended,  

the exterior angle is equal to sum of interior opposite angles