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Proposed ProblemClick the figure below to see the complete problem 387.See also:Complete Problem 387Collection of Geometry ProblemsLevel: High School, SAT Prep, College geometry
For treangles BFH, BFE, BFG, DFD Phifagor theorem BF^2=BH^2+FH^2 and etc. Then BF is diametr of this circle.
join B,F.sinve angleBHF+angleBGF=180 so B,H,F,S lie on same circle.simillarly the points B,E,F,D also concyclic.and angle BHF=BEF=90 so the points B,H,E,F are concylic and the points B,G,D,F are concyclic hence the points B,H,E,F,D,G discribe the same circle
There are 4 right angles at E, F, G and H and all these lie on a circle with BF as diameterSumith PeirisMoratuwaSri Lanka
Reference my proof for Problem 385, < BED = < EBG = < DGC since BEDG is cyclic and the result followsSumith PeirisMoratuwaSri Lanka