**Special Cases**

The semi-diameter of a sphere, circle, or interval is the same thing as its radius — namely, any line segment from the center to its boundary.

The semi-diameters of a non-circular ellipse are the halves of its extents along the two axes of symmetry. They are the parameters *a*, *b* of the implicit equation

Likewise, the semi-diameters of an ellipsoid are the parameters *a*, *b*, and *c* of its implicit equation

The semi-diameters of a superellipse, superellipsoid, or superquadric can be identified in the same way.

Read more about this topic: Semidiameter

### Other articles related to "special cases, case":

**Special Cases**

... If the circles have the same center but different radii, both the external and internal coincide with the common center of the circles ... This can be seen from the analytic formula, and is also the limit of the two homothetic centers as the centers of the two circles are varied until they coincide, holding the radii equal ...

... Damages is money claimed in compensation for some failure by the other party to a

**case**... Act 1858, which gave it that right, but in some

**special cases**it had been able to provide damages for over 600 years ... In Cardinal Beaufort's

**case**in 1453, for example, it is stated that "I shall have a subpoena against my feoffee and recover damages for the value of the land" ...

**Special Cases**

... This is true only for some very

**special cases**e.g ... the constraint forces (which is not usually the

**case**, so this derivation works only for

**special cases**), the constraint forces do no work ...

### Famous quotes containing the words cases and/or special:

“Colonel, never go out to meet trouble. If you will just sit still, nine *cases* out of ten someone will intercept it before it reaches you.”

—Calvin Coolidge (1872–1933)

“The English language is nobody’s *special* property. It is the property of the imagination: it is the property of the language itself.”

—Derek Walcott (b. 1930)