A school geometry. containing the substance of Euclid books II anfd III and part of book IV (1917)
Hall, H. S. (Henry Sinclair), 1848-1934, Stevens, F. H. (Frederick Haller), 1852-1933 · London : Macmillan · leaf 55
o P. Then the line PQ in its ultimateposition, when Q coincides with P, is atangent at the point P. Since a secant can cut a circle at two points only, it is clearthat a tangent can have only one point in common with thecircumference, namely the point of contact, at which twopoints of section… … TANGENCY.
Geometry
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