Question 361649
angle a and angle b
{{{a=15+b}}}
{{{a+b=90}}}
<p>
{{{15+b+b=90}}}
{{{15+2b=90}}}
{{{2b=75}}}
{{{highlight(b=37.5)}}}
{{{a=15+b}}}
{{{highlight(a=52.5)}}}