Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 46
Let C and D be the two centres, andsuppose the distance between them tobe equal to the sum of the radii, that is,to CA-\ AD The circumferences of the circles — will evidently have the points common, and they will have n »other. Because, if they had two points common, that, is if theycut each other… … THEOREM VII. If the distance between the centres of two circles ts equal ithe difference of their radii, the two circles will touch each otbinternally. Let C and D be the centres of twocircles at a distance from each otherequal to AD—AC—CD. Fr Now, it is evident, as in the last theo- \ Vrem, that…
Geometry · Plane trigonometry
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