Strictly speaking, the ratio of circumference to diameter for a circle equals π as we know it
A)in flat space.
B)on a spherical surface.
C)on a saddle-shaped surface.
D)all or any of the above
E)none of the above

Question

Quizplus · Accepted Answer

The ratio of the circumference to the diameter of a circle equals π in Euclidean (flat) geometry, which is the geometry of flat space. On spherical or saddle-shaped surfaces, which involve non-Euclidean geometries, this ratio differs from π.

Strictly Speaking, the Ratio of Circumference to Diameter for a Circle