A circle subdivided into one quarter, two eighths, and one half.
A circle subdivided into three quarters and two eighths.
A circle subdivided into one quarter, three twelfths, and one half.
Right triangle inscribed in semicircle. Illustration shows that the perpendicular from any point in…
Regular pentagon inscribed in a circle, circumscribed about a circle.
Illustration of a plane parallel to the base passing through a cone (section made is a circle).
Illustration of a plane parallel to the base passing through a cone (section made is a circle).
Illustration of a sphere generated by the revolution of a semicircle ACB about its diameter AB as an…
"Every section of a sphere made by a plane is a circle."