Question

In a triangle abc , angle b = 40 degrees and angle c = 50 degrees then find the exterior angle at the vertex
a.

Answer 1

Answer:

Exterior angle =opposite angle in interior

exterior angle at the vertex a=40degrees+50degrees=90dgrees

Answer 2

Answer:

90 degree

Step-by-step explanation:

exterior angle is equal to sum of two opposite interior angle.

so,

angle b+angle c=

40+50=90°