Question 690568
Greek word isoskeles, which is made up of two words: "isos," meaning "equal," and "skelos," meaning "leg."



by the Triangle Mid-segment Theorem, in a triangle a mid segment is always equal to half length of the base 


 so, {{{3x=(4x+20)/2}}} ...........solve for {{{x}}}


{{{3x*2=4x+20}}}

{{{6x=4x+20}}}

{{{6x-4x=20}}}

{{{2x=20}}}

{{{x=20/2}}}

{{{x=10}}}