Q: What is a ellipsoid?

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An ellipsoid.

The surface of the earth is called the crust. I hope this is the answer you need.

The diameter of the earth at the equator is 12,756.32 kilometers or 7,926.41 miles.The diameter of the earth through the poles is 12,715.43 kilometres or 7,901.00 miles.Thus the earth is 59 km or 25 miles wider than it is tall, giving it a slight bulge at the equator.This shape is known as an ellipsoid or more properly, geoid (earth-like), or oblate spheroid (squashed sphere).

A whispering gallery is usually constructed in the form of an ellipsoid, with an accessible point at each focus. When a visitor stands at one focus and whispers, the line of sound emanating from this focus reflects directly to the dish/focus at the other end of the room, and to the other person. Circular whispering galleries may provide "communication" from any part on the circumference to the diametrically-opposite point on the circumference.

The latitudes half way between the equator and poles are at 60 N & S At these latitudes the circumference is half of that at the equator. The Earth's circumference at the Equator is approx. 24,000 miles. At latitudes 60 N & S the circumference is 12,000 miles. At the poles N & S, latitude 90 N & S, the circumference is '0' (zero) ; a dot point. Taking an angular value for half way at 45 o N & S , the circumference is approximately 17,000 miles.

Related questions

Ellipsoid.

A hyperboloid.A sphere, ellipsoid, toroid or paraboloid intersected by a plane.There are probably others.A hyperboloid.A sphere, ellipsoid, toroid or paraboloid intersected by a plane.There are probably others.A hyperboloid.A sphere, ellipsoid, toroid or paraboloid intersected by a plane.There are probably others.A hyperboloid.A sphere, ellipsoid, toroid or paraboloid intersected by a plane.There are probably others.

No.

Newton was first claim that the earth is ellipsoid instead of spherical...

The joint between radius and scaphoid + lunate should fall into the category of an ellipsoid joint.

An ellipsoid.

No it is an oblate ellipsoid

A paraboloid and an ellipsoid.

your wrist is an ellipsoid joint

A semi-ellipsoid.

a sphere or an ellipsoid.

The term is ellipsoid (the special case, equal coordinate ellipsoid, is the sphere).