Please calculate the area of this right-angled triangle.

It's difficult to calculate the area of this hexagon.

He is known as an expert in subcritical nuclear experiments.

The Cultural Revolution is a part of China's history.

He claims to have seen an unidentified flying object.

Let's calculate the area of this right-angled triangle.

I started learning new things to broaden my horizons.

This basin was used in ancient washrooms.

I am majoring in auditory phonetics at university.

Linear programming is a part of operations research and is used to find the optimal solution.