Inductive Plane Geometry With Numerous Exercises Theorems And Problems for Ad
Inductive Plane Geometry With Numerous Exercises Theorems And Problems for Ad
G Irving George Irving Hopkins
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(?) . -. GJf bisects CD. (?) Similarly, LH is II to AF and bisects CD. . -. LH, MO, and ED are concurrent in point K. E-egarding AE as a transversal of the triangle CDF, AD ' BF- EC= AF ' BC ' ED. (?) AD BF EC^AF BCED^ /^s '** 2 * 2 * 2 2 ' 2 ' 2 * ^'^ . -. LK' MO' NH=LH - MK • iV^(7. (?) . -. L, M, and N are collinear. (?) q. E. D. If lines drawn from the vertices of a triangle are con- current, the product of three non-adjacent segments of the sides equals the product of the other three. Post.... Let ABC be a triangle, any point in its plane through which pass the lines AQ, CN, and BH. To Prove. BQ - HC - AN= QC - AH - NB. Dem. BQ. -HC-AO = BC'AH' QO. (BH is a transversal cutting A ACQ. ) qC ' AG ' NB==BC ' QO ' NA. (JSfC is a transversal cutting A ABQ. ) 172 Plane Geometry. " qC'NB NA ^'^ . -. BQ'HG'NA^qC^NB' AH, (?) q. E. D. (This is Ceva's theorem, discovered in 1678, and the follow- ing is its converse. ) 987. If three points are given on the sides of a triangle, or the sides extended so that the product of three non-adjacent segments of the sides equals the product of the other three, the lines joining these points with the opposite vertices are concurrent.
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