Assertion: shape | /r/HasProperty | known before his time
Facets:
value: by leonhard euler
type: OTHER
value: by leonardo da vinci
type: OTHER
Source sentences:
text: However, these shapes were known before his time, for instance by the designers of Gothic church windows, by Leonardo da Vinci, who used it for a map projection, and by Leonhard Euler in his study of constant-width shapes.