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sphere - segment Surface Area

A=2πh[(r1-r2)2+h2][(r1+r2)2+h2]4h2
(r1)Upper radius
(r2)Lower radius
(h)hight

The Surface Area of a Sphere Segment calculator computes the surface area of a slice of a sphere made by two parallel plane cutting through the sphere (See Diagram). The surface area is just for the sphere walls and does not include the top and bottom circles.

INSTRUCTIONS: Choose units and enter the following:

  • (r1) upper radius
  • (r2) lower radius
  • (h) distance between the parallel planes. (See diagram)  

Sphere Frustum Surface Area (A): The surface area is returned in square meters.  However, this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The Surface Area of a Sphere Segment formula is:

  A=2πh[(r1-r2)2+h2][(r1+r2)2+h2]4h2

where:

  • A = Surface Area of Sphere Segment (frustum)
  • r1 = top radius
  • r2 = bottom radius
  • h = distance between planes

This computes the surface area of a slice of a sphere made by two parallel plane cutting through the sphere (See Diagram) .  A sphere slice could be considered a sphere frustum.  The inputs are upper radius (r1), lower radius (r2) and the distance between (h).  The assumption is that both slices are in parallel planes. (See diagram)  The surface area does not include the top and bottom circles.


Sphere Calculators