The "What's this word/phrase?" thread

saru_yo Wrote:nice thing such a thread exists : )

I just stumbled across this one:
半径が３．１だから・・・
Does maybe anyone know how to pronounce 3.1 in Japanese?

Need context, but most likely はんけいが　さんてんいち　だから. Here's an example.

円周率は3.14159265358979です = えんしゅーりつは　さんてんいちよんいちごーきゅーにーろくごーさんごーはちきゅーななきゅー　です。