Elements of geometry : containing books I to III (1886)
Smith, J. Hamblin · Toronto : W.J. Gage · leaf 152
to the radius OB, /.I is a tangent to the ® at E. III. 16. Q. K. D, Ex. l. Shew that the two tangents, drawn from a point with-out the circumference to a circle, are equal, I.x. 2. If a quadrilateral .i li(l> be described about a circle.shew that the sum of AB equal to the sum of A I) and BC.… … Let the st. line DE touch the S ABC in the pt. C.Find 0 the centre, and join OC Then mu.4 OC be ± to DE. For if it be not, draw OBFi. to DE, meeting the Oce in B. Then Vl OFCisu it. angle, /. l OCF is less than a it. angle, I. 17. and .-. OC is greater than OF. I. 19. But OC=OB, .. OB is greater…
Geometry
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