Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 50
50 GEOMETRY PROPOSITION XIII. THEOREM. If the distance between the centres of two circles is equal to thesum of their radiiy the two circles will touch each other exter-nally. Let C and D be the centres at adistance from each other equal toCA+AD. The circles will evidently have thepoint A common,… … PROPOSITION XIV. THEOREM. If the distance between the centres of two circles is equal to thedifference of their radii, the two circles will touch each otherinternally. Let C and D be the centres at a dis-tance from each other equal to AD—CA. It is evident, as before, that they willhave the point A…
Trigonometry · Geometry
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