- China (Chinese: 中国; pinyin: Zhōngguó), officially the People’s Republic of China (PRC), is a country in East Asia. It is the world’s second-most populous country, with a population exceeding 1.4 billion. China spans the equivalent of five time zones and borders fourteen countries by land, tied with Russia as having the most of any country in the world. With an area of nearly 9.6 million square kilometres (3,700,000 sq mi), it is the world’s third largest country by total land area. The country consists of 22 provinces, five autonomous regions, four municipalities, and two special administrative regions (Hong Kong and Macau). The national capital is Beijing, and the most populous city and largest financial center is Shanghai.
- Regular octahedron (Wikipedia)
A regular octahedron is an octahedron that is a regular polyhedron. All the faces of a regular octahedron are equilateral triangles of the same size, and exactly four triangles meet at each vertex. A regular octahedron is convex, meaning that for any two points within it, the line segment connecting them lies entirely within it.
