Can goalkeeper hold the ball in the semi circle outside the 18 area?

Answer 1

No because it will be classed as handball and the other team will get a free kick.

Answer 2

Certainly he can. The penalty area allows him to handle the ball WITHIN that area, but as long as the tackle is legal, he can be challenged wherever he is on the pitch.

Answer 3

The semi circle describe is called the penalty arc and it is not considered part of the penalty area. A goal keeper may not touch the ball with their hands inside the penalty arc.