CIRCLE WITH A DOT

@TeaKayB @ColinTheMathmo then of course Lewis Carroll.

@ColinTheMathmo check out "Women Who Count" about 29 African American mathematicians. Shelly Jones is a friend of mine in Connecticut.

Women Who Count: Honoring African American Women in Mathematics

National Museum Of Mathematics (shop.momath.org)

@divbyzero ok, now do the cone vs. cylinder question... cylinder = 3•cone volume. Or cone vs (cylinder – cone) which would be 2•cone volume.
Or my absolute favorite: truncate a cone to make a frustum. Then the removed cone part and the frustum have volume ratio cone : frustum = cone height: (cone + frustum height)