t lines, the quadrilateral formed by these straight lines iscyclic, i.e., a circle may be described about it. 14. From any point P on the circumference of a circle, perjMjn-diculars PA, PB are drawn to two fixed diameters. Show that ABis constant in length. 17(j Ueometey. Proposition VIII. Theorem.… … Let ABC be a circle, and ACB au L in the segmentADB. Tlien the L ACB U equal to, less than, or greater thana rt. L, according as the segment ADB is a semicircle, orgreater than, or less than a semicircle. Let 0 be the centre of the circle.Join AO, OB, Then the ^AOB at the centre is < 2 rt. Ls,…
Geometry · Geometry, Plane
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