Question

h for a " alt="a 1 over 2 (a +b) h for a " align="absmiddle" class="latex-formula">

Answer 1

$A=\frac{1}{2}(a+b)h \\\\ 2A=(a+b)h \\\\ a+b=\frac{2A}{h} \\\\ \boxed{a=\frac{2A}{h}-b}$