Yes it is. Pie = 3.14 or a half circle is 180 degree's where as a full circle is 360 degrees. I fly small aircraft an we always make incomplete circles, it used everyday in the world with engineers and mathematicians. Each quarter circle is 90 degrees, multiplied by 4 equals 360 degrees which is a whole circle. Hope this helped you. John U.
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No it is a irregular shape
No because a regular polygon has equal sides and equal interior angles
semi-circle
A semi-circle the answere is semi-circle or a breve
Semi = half