tag:blogger.com,1999:blog-6933544261975483399.post5634711893683840346..comments2024-03-26T19:10:02.918-07:00Comments on Go Geometry (Problem Solutions): Elearn Geometry Problem 237: Quadrilateral, Midpoints, Exterior line, Perpendicular linesAntonio Gutierrezhttp://www.blogger.com/profile/04521650748152459860noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-6933544261975483399.post-56319034441004602722009-02-02T05:20:00.000-08:002009-02-02T05:20:00.000-08:00macsim gabriel florin has left a new comment on yo...<B>macsim gabriel florin</B> has left a new comment on your post "Elearn Geometry Problem 237: Square, Midpoints, Exterior Line...":<BR/><BR/>Let H' and F' be the projections of H and F on the exterior line. We obtain the trapezoids HH'F'F, AA'D'D and BB'C'C. In this trapezoids we have :<BR/>m = (HH'+FF')/2;<BR/>HH'=(AA'+DD')/2=(a+d)/2<BR/>FF'=(BB'+CC')/2=(b+c)/2<BR/>From this relations results :<BR/>m=(a+b+c+d)/4 that it mean :<BR/>4m=a+b+c+d.Anonymousnoreply@blogger.com