A semicircle is the figure contained by the diameter and the circumference cut off by it. And the center of the semicircle is the same as that of the circle.
Father of geometry
Found in 2 providers: deepseek,grok
Cross Reference
2 sources
"Let it be granted that all right angles are equal to one another."
Strange & Unusual"If four magnitudes be proportional, the rectangle contained by the extremes is equal to the rectangle contained by the means."
Strange & Unusual"A plane angle is the inclination of the lines to one another, when two lines meet one another, but are not in the same straight line."
Shocking"To describe a circle with any centre and radius."
Shocking"In isosceles triangles the angles at the base are equal to one another, and, if the equal straight lines be produced further, the angles under the base will be equal to one another."
Strange & Unusual