tag:blogger.com,1999:blog-6933544261975483399.post8515307344823059135..comments2024-03-26T19:10:02.918-07:00Comments on Go Geometry (Problem Solutions): Elearn Geometry Problem 214: Quadrilateral, Angle BisectorsAntonio Gutierrezhttp://www.blogger.com/profile/04521650748152459860noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-6933544261975483399.post-66626140599272295302009-11-06T13:15:32.495-08:002009-11-06T13:15:32.495-08:001st mistake to the anonunous solution :
In the 1s...1st mistake to the anonunous solution : <br />In the 1st equation "BAC" should be replaced with BAD.<br />2nd mistake : if -2X=-A-D then 2X=A+D, so X=(A+D)/2 and not X=(A-D)/2.<br />Hoever his solution (with the above corrections) is right and elegant.<br />G. PlatisAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-6933544261975483399.post-9938885359570907892009-01-02T13:48:00.000-08:002009-01-02T13:48:00.000-08:00BAC + CDA + ABC + DCB = 360 (1)B/2 + C/2 + x = 18...BAC + CDA + ABC + DCB = 360 (1)<BR/>B/2 + C/2 + x = 180 (2)<BR/><BR/>B + C = 360 - 2x <BR/>B + C = 360 - A - D<BR/><BR/>then 360 - 2x = 360 - A - D<BR/> -2x = -A -D<BR/> x = (A-D)/2Anonymousnoreply@blogger.com