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diagram : http://prntscr.com/miwwjw

 

question: http://prntscr.com/miwwup

 Feb 9, 2019
 #1
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If we draw  a perpendicular  from D to CB....we will have a right triangle with a hypotenuse of 13  and a height DM (leg) of 12

 

So....call the intersection of this perpendicular and CB, M

 

So  using the Pythagorean Theorem.....we can find  CM   as

 

CM  =  sqrt ( DC^2 - DM^2 )   =   sqrt (13^2 - 12^2 ) =  sqrt (169 - 144) =  sqrt (25)  = 5

 

So....M is the point  (5, 0)......and it has the same x coordinate as D

 

cool  cool  cool

 Feb 9, 2019

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