Assertion: rectangle's area | /r/HasProperty | enclosed by circle
Facets:
Source sentences:
text: In the 5th century BCE, Hippocrates of Chios was the first to show that the area of a disk (the region enclosed by a circle) is proportional to the square of its diameter, as part of his quadrature of the lune of Hippocrates, but did not identify the constant of proportionality.
text: The formula for the area of a circle (more properly called the area enclosed by a circle or the area of a disk) is based on a similar method.