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五角形 (gokakukei) Japanese meaning: pentagon | Kotomora

五ご角かく形けい

ご

か

く

け

い

Freq.FrequencyTop 100,000

Meanings

1

Geometric term for a five-sided polygon. The reading ごかっけい is a common variant.

正せい五ご角かく形けいの内ない角かくの和

わ

は

540

度ど

です

。

The sum of the interior angles of a regular pentagon is 540 degrees.

この図ず形けいは五ご角かく形けいです。

This shape is a pentagon.

Kanji

五five
角angle, corner, square
形shape, form, style

Related words

ペンタゴン
五角形 is the normal Japanese word for a five-sided polygon, whereas ペンタゴン in this geometric sense is rare and mostly used as a stylistic borrowing.

Word family

正せい五ご角かく形けい
regular pentagon

Built from

五ご角かく+形けい

Written forms

五角形
- ごかくけい
  Standard kanji spelling for 'pentagon'.
- ごかっけい
ごかっけい

Etymology

Compound of 五 (go, 'five'), 角 (kaku, 'angle'), and 形 (kei, 'shape').