Question 1106391
v, vertex angle
b, each base angle
{{{v=-6+4b}}}



{{{v+b+b=180}}}
{{{v+2b=180}}}
{{{2b+4b-6=180}}}
{{{6b=180+6}}}
{{{b=186/6}}}
{{{b=31}}}


{{{v=4*31-6}}}
{{{highlight(v=118)}}}