oint. Corollary 2. For the same reason the perpen-dicular to a tangent at its point of contact,passes through the centre. Corollary 3. Since only one straight line can bedrawn perpendicular to a given straight line from apoint without it, the line drawn from the centreperpendicular to a tangent… … Let PAB, PCD be two circles touching at P; and letE, F be their centres. Then EF, lyroduced if necessary, passes through P. Since the circles touch at P, they have at P a com-mon tangent. (Page 182.) Also the radii PE, PF are both _Lr to this commontangent at P; (IV., 10.) .. E, P, F are in the…
Geometry · Geometry, Plane
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