Euclid's geometry (fl. c. 300 BC)
The circumference of a circle is pi times the
circle's diameter (definition of pi). The value of pi was known to be approximately
3. Until Archimedes arrived, no one had attempted to calculate a more
accurate value.
The area of a circle is a constant (?) times the
square of the circle's radius.
The volume of a cylinder is the area of the circular base times its height (due to Eudoxus?).
The volume of a cone is 1/3 of the volume of the cylinder that surrounds it (due to Eudoxus).