Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 41
14. Two circles are said to toucheach other internally, when one lieswithin the other, and their circumfe-rences have but one point in common. … 15. Two circles are said to toucheach other externally, when one lieswithout the other, and their circumfe-rences have but one point in common
Geometry · Plane trigonometry
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-97-195.webp)
