Question 869323
One side is s, known but value not given.
Another side is c, unknown.
and hypotenuse, call variable h, known.  h=12.


You want to find c, and use it to create the formula for area.
{{{s^2+c^2=h^2}}}
{{{c^2=h^2-s^2}}}
{{{c=sqrt(h^2-s^2)}}}
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Expression for the area, {{{(1/2)s*c=highlight((1/2)s*sqrt(h^2-s^2))}}}.