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Basic 3D geometry

In a continuation of the geometry theme, let’s move from 2D geometry to 3D.

First, simple extensions of two dimensional objects:
円柱 – えんちゅう – cylinder (extension of a circle)
立方体 – りっぽうたい – cube (extension of a square)
直方体 – ちょくほうたい – cuboid (extension of a rectangle)

The extensions of two dimensional polygons are prisms:
角柱 – かくちゅう – prism
三角柱 – さんかくちゅう – triangular prism
四角柱 – しかくちゅう – square prism
五角柱 – ごかくちゅう – pentagonal prism/column
六角柱 – ろっかくちゅう – hexagonal prism/column
七角柱 – しちかくちゅう – heptagonal prism/column
八角柱 – はっかくちゅう – octagonal prism/column

A slight modification to an extension creates a cone or pyramidal shape:
円錐 – えんすい – cone
三角錐 – さんかくすい – a three sided pyramid (tetrahedron)
四角錐 – しかくすい – a four sided pyramid (square pyramid)
五角錐 – ごかくすい – a five sided pyramid (pentagonal pyramid)
六角錐 – ろっかくすい – a six sided pyramid (hexagonal pyramid)

Now, more uniquely three dimensional objects:
球 – きゅう – sphere
球体 – きゅうたい – solid sphere

回転楕円体 – かいてんだえんたい – spheroid
扁平楕円体 – へんぺいだえんたい – oblate spheroid
扁長楕円体 – へんちょうだえんたい – prolate spheroid

トールス – とーるす – torus

Obviously, there are many more geometric figures, but this seems like enough for one post.

This entry was posted on Tuesday, October 12th, 2010 at 12:12 pm and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.

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