Where does “Geodreieck” come from?

Geodreieck (German) comes from German Dreieck, from German Drei, from Middle High German drī, from Old High German drī, from Proto-West Germanic þrīʀ, from Proto-Germanic þrīz, from Proto-Indo-European *tréyes.

Geodreieck (German): set square 90-45-45 triangle with an integrated protractor made of clear plastic

Definitions

  1. set square 90-45-45 triangle with an integrated protractor made of clear plastic

Ancestry of “Geodreieck”, step by step

StepLanguageWordMeaning
1GermanDreiecktriangle
2GermanDreithree
3Middle High Germandrīthree
4Old High Germandrīthree
5Proto-West Germanicþrīʀthree
6Proto-Germanicþrīzthree
7Proto-Indo-European*tréyes—
Every word from Proto-Indo-European *tréyes →Every word from Proto-Germanic þrīz →Every word from Proto-West Germanic þrīʀ →