Linked from

The 7 pages that link to Unit sphere, each with the reason it gives.

• Solid angleRelated: Its surface area provides the defining measure for a solid angle.

• Unit circleCompared with: It generalizes the unit circle from a plane to three dimensions.

• Spherical law of cosinesRelated: On a unit sphere, arc lengths and central angles have the same numerical value.

• Spherical triangleNarrower topic: On this sphere, arc lengths equal their central angles in radians.

• Spherical coordinate systemRelated: The two angular coordinates specify a point on this sphere.

• 3-sphereBroader topic: Setting the radius to one gives the standard equation for the 3-sphere.

• Riesz's lemmaRelated: Rescaling the constructed vector places it on the unit sphere without losing the desired estimate.