Question 924206
Since it's a right triangle,
{{{a=c*sin(36)}}}
{{{b=c*sin(54)}}}
Substituting into the perimeter,
{{{a+b+c=28}}}
{{{c*sin(36)+c*sin(54)+c=28}}}
{{{c=28/(1+sin(36)+sin(54))}}}
{{{c=11.68}}}
Then,
{{{a=11.68*sin(36)=6.87}}}
{{{b=11.68*sin(54)=9.45}}}