Hey there!!
( i ) We will use the exterior angle property.
... 19x + 8 = 75 + 6x + 11
... 19x + 8 = 86 + 6x
... 13x = 78
... x = 6
angle SAB = 19x + 18
We know the value of x
... 19 ( 6 ) + 18
... 132° is the answer
( iii )
We got angle 4 as 136.
Let's take angle 1 as ' x '
Then,
136 + 2x = 180
As the triangle is an isosceles triangle.
2x = 44
x = 22
The answer is 22°
Hope my answer helps!!
