Mr. Tsuboki is my best friend.

He ate three apples.

The character '喰' means to eat.

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.