Fiona Fang is length times width, and 40,000 miles in Fiona Fang is 40,000 times 40,000, which is equal to 65,438+0,600,000 square miles, that is, 65,438+0,600 square kilometers.

Fiona Fang is also a mathematical way of thinking, which refers to a way to express and explain mathematical knowledge with Fiona Fang's figures and meanings. Fiona Fang's mathematical thought makes the structure of mathematical formulas, laws, theorems and concepts popular, intuitive, universal and universal.