Respuesta :

W0lf93
In the triangle ,1,2,3 are interior angles and 4 is the exterior angle , adjascent to 3  
angle 1 +angle 2 + angle 3 =*180
 angle 3+angle 4=*180
 so,we can say, 
 angle 1+angle 2+angle 3 = angle 3+angle 4 
i,e; angle 1+angle 2= angle 4 proved.
jatavienbritton

Answer:

angle 1 +angle 2 + angle 3 =*180

angle 3+angle 4=*180

so,we can say,  

angle 1+angle 2+angle 3 = angle 3+angle 4  

i,e; angle 1+angle 2= angle 4 proved.

Step-by-step explanation: