Here's a statement that may or may not answer the question ... it's hard to tell:
When you sit at the center of a semicircle, its ends are 180 degrees apart as seen
from your viewpoint.
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There are 180 degrees in a semi-circle.
360 degrees and 180 degrees respectively
Quarter: 90 degrees semi: 180 degrees
If the semicircle is placed on 1 side of the rectangle:Find the total perimeter(circumference) of the side opposite to the one with the semicircle's base and the 2 sides perpendicular to the semicircle's base.The formula for circumference of a circle is 2πr.Thus for the semicircle we will take the circumference as πr.Find the sum of 1st and 2nd points. This is the final answer.
the angle on a straight line is 180 degrees, the angle of semicircle at centre is 180 degrees