sphere

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

sphere with circumscribing cylinder

Discover

Still from the 2017 movie IT, Bill Skarsgard plays Pennywise the clown. Directed by Andy Muschietti

10 Famous Clowns: From Comical to Creepy

VAN, TURKEY - OCTOBER 25: A building and car ruined during the earthquake of Van-Ercis on October 25, 2011 in Van, Turkey. It is 604 killed and 4152 injured in Van-Ercis Earthquake.

What Is an Aftershock?

number zero, 0 balloon

Is Zero an Even or an Odd Number?

Mayer Amschel Rothschild (1744-1855), founder of the house of Rothschild; lithograph by Friedrich Lieder, c. 1830.

Where Do Antisemitic Conspiracy Theories About the Rothschild Family Come From?

earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.

The 6 Deadliest Earthquakes Since 1950

Gills of three old specimens of webcap fungus (Cortinarius) in Gloucestershire, South West England. toxic, fungi, poisonous mushroom

7 of the World’s Most Poisonous Mushrooms

Fish. Lionfish. Lion-fish. Turkey fish. Fire-fish. Red lionfish. Pterois volitans. Venomous fin spines. Coral reefs. Underwater. Ocean. Red lionfish swims by seaweed.

10 of the World’s Most Dangerous Fish

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 pseudosphere Ewald’s sphere 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