Question 337189
1.{{{A+C=90}}}
2.{{{A+S=180}}}
3.{{{C+S=214}}}
From eq. 1 and eq. 2,
{{{A+C+A+S=270}}}
{{{2A+C+S=270}}}
Substitute eq. 3,
{{{2A+214=270}}}
{{{2A=56}}}
{{{highlight_green(A=28)}}}degrees