= 180- 1/2( 180-60)

= 120

First make a picture.

Angle BAC+ Angle C+ Angle B= 180.

Angle C= angle b+36.

Find out:

Angle B = 34

Angle C = 70

In the right triangle ABD

Angle difference =90-34=56

Angle EAD=56- Angle BAC/2=56-38= 18.

3. It won't change, because the sum of the internal angles of the triangle OAB is 180 degrees, so the angle OAB+ the angle Oba = 180 degrees-the angle O=90 degrees, then the angle shell+the angle ABX=( 180- the angle OAB)+(/kloc-0)