Spherical pi
is the ratio between length of a circumference of a circle to the length of its diameter.
What is for a circle on the surface of a sphere?
Drag the slider on the right to make b=0. What is value of for that circle (the ratio C/D)?
What quantity does represent in the figure?
Drag the slider on the right to make b=0.5. What is the value of for that circle?
Continuing dragging the slider...how does the value of b vary with the value of ?
What is the limit of as the radius of a spherical circle approaches 0?