You can choose between 4 circles.
The circle has been known since before the beginning of recorded history. Natural circles are common, such as the full moon or a slice of round fruit. The circle is the basis for the wheel, which, with related inventions such as gears, makes much of modern machinery possible.
Ancient Egypt (circa 3000 BCE - 30 BCE): The ancient Egyptians used circles in their architectural designs and artwork. The circle was also associated with the sun god Ra, and circular symbols, like the solar disk, were common in their religious iconography.
Ancient Greece (circa 800 BCE - 146 BCE): The ancient Greeks made significant contributions to the understanding of circles. Euclid, a Greek mathematician, included the definition of a circle and its properties in his influential work "Elements," around 300 BCE. The constant ratio of a circle's circumference to its diameter, known as π (pi), was also studied by the Greeks.
20th century to the present: The study of circles continued to evolve with the advent of modern mathematics. The field of topology explored properties of shapes, including circles, from a more abstract perspective. In the 20th and 21st centuries, technology and computer science further expanded the applications of circles in areas such as computer graphics, computer-aided design, and more.
Today, circles remain a fundamental concept in mathematics and have widespread applications in various scientific and technological fields. The historical journey of understanding circles reflects the collaborative efforts of mathematicians and scholars across different cultures and eras.