I dont know the four, but there is time, place, physical surroundings, and ive heard the fourth is circumstances
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are the four quadrants.
75% shaded; 25% unshaded
"Trisecting" is cutting into three equal parts, not four. Trisecting is impossible. Cutting into four equal parts is possible though, and trivial once you know how to bisect an angle.
quarter
Four times as much as what you started with divided into four equal parts.