sphere

Table of Contents

Introduction References & Edit History Related Topics

Images

The normal, or perpendicular, at each point of a surface defines the corresponding tangent plane, and vice versa.

sphere with circumscribing cylinder

Discover

United States elections portal page linking to each election interactive

A History of U.S. Presidential Elections in Maps

Hemp (Cannabis sativa).

9 Mind-Altering Plants

Malayan Leaf Frog - Megophrys nasuta

9 Animals That Look Like Leaves

Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.

9 of the World’s Deadliest Mammals

Flag of Bhutan

6 Small Kingdoms of the World

Alcoholic beverages bottles at Host 2013, international exhibition of the hospitality industry on OCTOBER 18, 2013 in Milan.

Why Is Alcohol Measured by Proof?

Dr. Martin Luther King Jr. addresses marchers during his "I Have a Dream" speech at the Lincoln Memorial in Washington. August 28th 1963

Was Martin Luther King, Jr., a Republican or a Democrat?

sphere: Related Content

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Photos

The normal, or perpendicular, at each point of a surface defines the corresponding tangent plane, and vice versa.

sphere with circumscribing cylinder

See All Images →

Topics

Poincaré conjecture spherical triangle Ewald’s sphere pseudosphere rhumb line geodesic ellipsoid cone paraboloid hyperboloid cylinder

Key People

Archimedes

Archimedes

Greek mathematician

Menelaus of Alexandria

Greek mathematician

Quiz

Equations written on blackboard

Numbers and Mathematics