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

He made up his mind to face the difficulties.

He is receiving treatment for pulmonary tuberculosis.

Japan's administrative divisions are divided into prefectures and municipalities.

My friend was diagnosed with keratoconus.

My mother is going to the ophthalmologist because of keratitis.

The amygdala is a part of the brain that controls our emotions.

He was drawing a figure using a set square.

I'm fed up with his crappy posts.

He was trolling on the bulletin board.