Determine
You build a roof over your coat rack because you determine that this is the best way to protect your coats from the elements.
てい, じょう
さだ
None
Why did you determine your coat rack needed a roof? Because your coat pockets are full of tater (てい) tots! You can't afford to let your tater tots get rained on, so you determined they needed to be properly sheltered with a roof.