不ふ等とう辺へん三さん角かっ形けい

also: ふとうへんさんかくけい

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Meanings

scalene triangle

A triangle with all three sides of different lengths. Used in geometry contexts.

二に等とう辺へん三さん角かっ形けい
An isosceles triangle has two equal sides, while a scalene triangle has no equal sides.
正せい三さん角かっ形けい
An equilateral triangle has all sides equal, unlike a scalene triangle.

不等辺三角形
- ふとうへんさんかっけい
  Standard kanji spelling for this geometry term.
- ふとうへんさんかくけい
  Alternate reading; さんかくけい is a common pronunciation of 三角形.
ふとうへんさんかくけい

Compound of 不等辺 (unequal sides) + 三角形 (triangle). The term is a direct calque from Western geometry terminology.