The denuclearization of North Korea is an important issue for world peace.

A round angle is 360 degrees.

This figure can be solved using the double-angle formula.

That information is not yet verified.

The polyhedral angle of this cube is 90 degrees.

The yūkaku of the Edo period was a world completely different from modern entertainment.

Normalization of a database is important to avoid data duplication.

By normalizing the data, analysis becomes easier.

The yūkaku (licensed red-light districts) of the Edo period had a culture greatly different from today's sex industry.

This kanji has many strokes, doesn't it?