Infinite photos and videos for every Wiki article ·
Find something interesting to watch in seconds

Celebrities
Largest Empires
Tallest Buildings
Orders and Medals
Great Cities
Presidents
Best Campuses
Kings of France
British Monarchs
History by Country
Great Artists
Wonders of Nature
Largest Palaces
Animals
Countries of the World
World Banknotes
Richest US Counties
Supercars
Recovered Treasures
Sports
Rare Coins
Famous Castles
Crown Jewels
Great Museums
Ancient Marvels
Wars and Battles

more top lists

Cross section (geometry)

Videos

Page
In geometry and science, a cross section is the non-empty intersection of a solid body in three-dimensional space with a plane, or the analog in higher-dimensional spaces. Cutting an object into slices creates many parallel cross-sections. The boundary of a cross-section in three-dimensional space that is parallel to two of the axes, that is, parallel to the plane determined by these axes, is sometimes referred to as a contour line; for example, if a plane cuts through mountains of a raised-relief map parallel to the ground, the result is a contour line in two-dimensional space showing points on the surface of the mountains of equal elevation.

Pinus taeda cross-section showing annual rings, Cheraw, South Carolina.

Contour line

Videos

Page
A contour line of a function of two variables is a curve along which the function has a constant value, so that the curve joins points of equal value. It is a plane section of the three-dimensional graph of the function parallel to the -plane. More generally, a contour line for a function of two variables is a curve connecting points where the function has the same particular value.

A three-dimensional surface, whose contour graph is below.

Edmond Halley's New and Correct Chart Shewing the Variations of the Compass (1701)