He is composing a poem.

He is studying late into the night to learn a new computer language.

In linear algebra, triangular matrices play a very important role.

A lower triangular matrix is a matrix where all the elements below the main diagonal are zero.

There is a complex love triangle between them.

Please calculate the area of this right-angled triangle.

I analyze data using a spreadsheet software.

My father runs a real estate business.

The separation of powers is one of the basic principles of democracy.

In order to solve problems, it is important to listen to the opinions of many people, as the saying goes, 'two heads are better than one'.