Question

find the measure of unknown angles ( b , b , a 105 degree )​

Answer 1

Answer:

<a+105=180, therefore<a=180-105=75° Now,75°+<b+<b=180, 2<b=180-75, <b=105/2=54.5°

Step-by-step explanation:

Answer 2

let angle1 = 105°

angle a + angle1 = 180° (linear pair)

angle a + 105° = 180°

angle a = 180° - 105°

= 75°

In ∆,

b + b + a = 180° (angle sum property of∆)

2b + 75° = 180°

2b = 180° - 75°

= 105°

b = 105°/2

b = 50° (approx)