① round the two ends of the diameter of the circle into two arcs, each arc is called the semicircle. ② semicircle (arc) and the diameter of the plane enclosed by.
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No. 2
◎ semicircle bànyuán
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No. 3
From the diameter of the circle from one end of the part; equal to half the circumference of the arc. Also known as "Half Round Week"
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No. 4
Area of a circle divided by diameter in either half
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No. 5
Form a semicircle or semi-week object or object array formation