Question 936034
one side  =  20 x
 other side   = 9x
area  = 720 cm^2
   area  = {{{ (1/2)* one side *other side}}}
    720 = {{{ (1/2)*20x*9x}}}
             {{{720 = 10x*9x}}}
 {{{720 = 90 x^2}}}
   divide with 90 on both sides
 {{{ 720/90 =  90 x^2 /90}}}
      {{{ 8 = x^2}}}
 as per Pythagorean theorem
  {{{ hypotenuse ^2 =  base ^2+ height ^2}}}
    so   {{{hypotenuse ^2 =  oneside ^2+ otherside^2}}}
             {{{ hypotenuse^2  = (20x)^2+(9x)^2}}}
                {{{  hypotenuse^2  = 400 x^2+81 x^2}}}
                    {{{ hypotenuse^2 =481 x^2}}}
                             but{{{ x^2 =8}}}
                    {{{ hypotenuse^2 =481 x^2}}}
                          {{{ hypotenuse ^2  = 481*8}}}
                           {{{ hypotenuse^2 =3848}}}
              {{{ hypotenuse  = sqrt(3848)}}}
                           hypotenuse  = 62.03  cm
Result : Hypotenuse  = 62.03 cm