tet-ruh-kay-duh-ka-gon
Here's a breakdown:
* tet-ruh: The "tet" sounds like the start of "tetra"
* kay-duh: The "kaide" sounds like "kay-duh"
* ka-gon: The "gon" sounds like the end of "polygon"
It's a bit of a mouthful, but you'll sound smart saying it correctly!