Countries around the world are caught up in an arms race.

The cytoskeleton plays a crucial role in maintaining the shape of the cell.

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.

Because of his color blindness, he has difficulty distinguishing between red and green.

Please calculate the area of this right triangle.

The development of fusion reactors could potentially be the key to solving future energy problems.

He drew an equilateral triangle shape.

Tomorrow's flight has been cancelled as planned.