360 ÷ 3 = 120 degrees
Therefore the circle (360 degrees) has been split into 3 parts of 120 degrees each.
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Only the diameter can divide the circle in to two equal parts.
A line segment that divides a circle in two is a chord.If the two parts of the circle are equal, the line segment is a diameter.See 'The Parts of the Circle' in Sources and related links, below.
hemisphere
The three parts are:the interior of the circle, the points on the circle (points on its circumference) the outside of the circle.
It's a chord, unless the 2 parts are equal, when it becomes a diameter.