answer sheet coordinate settings

[yunustalip]

Hi, can you explain in detail all the settings below to create a new answer sheet? For example, why is the answer sheet 740x1049 according to which unit?
or why ANSWER_PATCH_HEIGHT_WITH_MARGIN what does 80 represent and in what unit?
Thanks..
ANSWER_SHEET_WIDTH = 740
ANSWER_SHEET_HEIGHT = 1049

ANSWER_PATCH_HEIGHT = 50
ANSWER_PATCH_HEIGHT_WITH_MARGIN = 80
ANSWER_PATCH_LEFT_MARGIN = 200
ANSWER_PATCH_RIGHT_MARGIN = 90
FIRST_ANSWER_PATCH_TOP_Y = 200

ALTERNATIVE_HEIGHT = 50
ALTERNATIVE_WIDTH = 50
ALTERNATIVE_WIDTH_WITH_MARGIN = 100