Of those choices, centralized area is the closest.
"Periphery" means the outermost boundary of an area.
The economic boundary of an area.
It seems like there may be a typo in your question. The correct spelling is "periphery," which refers to the outer edges or boundary of something. It can also be used to describe something that is on the outskirts or margin of a particular area or topic.
When margin is increased, the area for text might increase or decrease. It depends on margin area.
The focal area is often the largest flower in the arrangement.
A centralized region is exactly like what it sounds like it would be. A centralized region is an area that is located in a the center of the things around it.
focal meaning center so there is no specific pathology in the central area of the disease
That depends on the shape of the area. You can have different shapes that have the same area, but a different circumference.
When Janet looked closely into the periphery of the area where the spotlight was shining, she could see John in the shadows, standing on the edge of the action, as usual.
a central search on the world or in your area
The browser sets the margin. The size is determined by the browser. The margin clears an area around an element. The margin can be adjusted to your specific needs.
Intra-alveolar means between the alveoli. Focal means within a limited area. There are both adjectives and the phrase is missing a noun. (In other words, focal intra-alveolar...what?)