It's difficult to hit a trifecta.

His message ended with a three-dot ellipsis, suggesting something.

This figure is an acute triangle.

He taught me how to calculate the area of an obtuse triangle.

His company was a short-lived regime.

I am attending cooking classes to learn the technique of filleting fish.

He can do a perfect handstand.

His trilogy is very popular.

I can't understand what's in his mind.

He conveyed the schedule of the meeting in a three-line email.