1) The major arc is CD having points A, B on it.
2) An area covered by an arc AB (or arc ADCB) and the diameter AB (or ALB) represents a semicircle in circle L.
What is major arc?
"It is the longer arc connecting two endpoints on the circumference of a circle."
What is semicircle?
"It is a half of a circle."
For given example,
1) Consider an arc in the direction CBAD.
This represents a major arc.
The angle subtended by this arc is greater than 180°
Therefore, the major arc is CD having points A, B on it.
2) An area covered by an arc AB (or arc ADCB) and the diameter AB (or ALB) represents a semicircle in circle L.
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