Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 47
ould not be equal to CD, thvdistance between their centres : therefore, they cannot havetwo points in common when the difference of their radii isequal to the distance between their centres : hence, they aretangent to each other. Sch If two circles touch each other, either externally 01internally,… … Lt-\ BAD he an inscribed angle : thenwill it be measured by half the arc BED,whuh subtends it. For, through the centre C draw thediameter ACE, and draw the radii BC,CD. Then, in the triangie ABC, the exte-rior angle BCE is equal to the sum ofthe interior angles B and A (Bk. I. Th. xvi). But since…
Geometry · Plane trigonometry
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